<SUBMISSION>
<ACCESSION-NUMBER>0001104659-07-060206
<TYPE>S-8
<PUBLIC-DOCUMENT-COUNT>3
<FILING-DATE>20070808
<DATE-OF-FILING-DATE-CHANGE>20070808
<EFFECTIVENESS-DATE>20070808
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>PROS Holdings, Inc.
<CIK>0001392972
<ASSIGNED-SIC>7371
<IRS-NUMBER>760168604
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>S-8
<ACT>33
<FILE-NUMBER>333-145237
<FILM-NUMBER>071035598
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>3100 MAIN STREET
<STREET2>SUITE 900
<CITY>HOUSTON
<STATE>TX
<ZIP>77002
<PHONE>713-335-5151
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>3100 MAIN STREET
<STREET2>SUITE 900
<CITY>HOUSTON
<STATE>TX
<ZIP>77002
</MAIL-ADDRESS>
</FILER>
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<TYPE>S-8
<SEQUENCE>1
<FILENAME>a07-21278_1s8.htm
<DESCRIPTION>S-8
<TEXT>
<html>

<head>






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<body lang="EN-US">

<div style="font-family:Times New Roman;">
 <h2 align="center" style="font-weight:normal;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><a name="scotch"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">As filed with the Securities and Exchange Commission on August 8, 2007</font></b></a></h2> <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0pt 0pt 0pt 0pt;"> <h2 align="center" style="border:none;font-weight:normal;margin:0pt 0pt 12.0pt;padding:0pt;page-break-after:avoid;text-align:center;text-indent:360.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registration No.: 333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font></h2> </div>

<p style="font-weight:bold;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;">UNITED STATES</font></b></p>

<p style="font-weight:bold;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;">SECURITIES AND EXCHANGE COMMISSION</font></b></p>

<p style="font-weight:bold;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Washington, D.C. 20549</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="line-height:9.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><hr size="1" width="160" noshade color="black" align="center" style="width:120.0pt;"></div>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-weight:bold;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;">FORM&nbsp;S-8</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-weight:bold;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;">REGISTRATION STATEMENT</font></b></p>

<p style="font-weight:bold;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;">Under</font></b></p>

<p style="font-weight:bold;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;">The Securities Act Of 1933</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="line-height:9.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><hr size="1" width="160" noshade color="black" align="center" style="width:120.0pt;"></div>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-weight:bold;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;">PROS HOLDINGS, INC.</font></b></p>

<p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact name of Registrant as specified in its charter)</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="line-height:9.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><hr size="1" width="160" noshade color="black" align="center" style="width:120.0pt;"></div>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div align="center">

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="font-size:10.0pt;margin:0pt 0pt .0001pt;text-align:center;"><!-- SET mrlNoTableShading --><b>Delaware</b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">76-0168604</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or Other
  Jurisdiction of</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(I.R.S. Employer</font></p>
  </td>
 </tr>
 <tr>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Incorporation or
  Organization)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Identification
  Number)</font></p>
  </td>
 </tr>
</table>

</div>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">3100 Main Street, Suite 900</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Houston, TX 77002</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Telephone: (713)&nbsp;335-5151</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address,
Including Zip Code, and Telephone Number,</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Including
Area Code, of Registrant&#146;s Principal Executive Offices)</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="line-height:9.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><hr size="1" width="160" noshade color="black" align="center" style="width:120.0pt;"></div>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">1999 EQUITY INCENTIVE PLAN</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">2007 EQUITY INCENTIVE PLAN</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(Full title of the plan)</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="line-height:9.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><hr size="1" width="160" noshade color="black" align="center" style="width:120.0pt;"></div>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Albert E. Winemiller</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Chief Executive Officer and President</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">3100 Main Street, Suite 900</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Houston, TX 77002</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Telephone: (713)&nbsp;335-5151</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Name,
Address, Including Zip Code, and Telephone Number, Including Area Code, of
Agent for Service)</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-weight:bold;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Copy to:</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">John J. Gilluly III, P.C.</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">DLA Piper US LLP</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1221 South MoPac Expressway, Suite 400</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Austin, TX 78746</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(512) 457-7000</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="line-height:9.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><hr size="1" width="160" noshade color="black" align="center" style="width:120.0pt;"></div>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CALCULATION OF REGISTRATION FEE</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="32%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:32.7%;">
  <p style="font-size:8.0pt;font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><!-- SET mrlNoTableShading -->Title&nbsp;of&nbsp;Securities&nbsp;to&nbsp;be&nbsp;Registered</p>
  </td>
  <td width="2%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="13%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Amount&nbsp;to&nbsp;be<br>
  Registered&nbsp;(1)</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="13%" colspan="2" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Proposed&nbsp;Maximum<br>
  Offering<br>
  Price&nbsp;Per&nbsp;Share</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="13%" colspan="2" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Proposed&nbsp;Maximum<br>
  Aggregate<br>
  Offering&nbsp;Price</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="13%" colspan="2" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Amount&nbsp;of<br>
  Registration&nbsp;Fee</font></b></p>
  </td>
  <td width="0%" valign="bottom" style="border-bottom:solid windowtext 1.0pt;border-left:none;border-right:none;border-top:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:.34%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="32%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:32.7%;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;page-break-after:avoid;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Common Stock $0.001 par
  value</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="13%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="13%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="13%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="13%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="0%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:.34%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="32%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:32.7%;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;page-break-after:avoid;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#151;Outstanding under the
  1999 Equity Incentive Plan</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="13%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">342,260&nbsp;shares</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">0.96</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">328,570</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">11</font></p>
  </td>
  <td width="0%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:.34%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="32%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:32.7%;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;page-break-after:avoid;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#151;Outstanding under the
  2007 Equity Incentive Plan</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="13%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1,388,000 shares</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6.84</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(3)</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">9,493,920</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">292</font></p>
  </td>
  <td width="0%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:.34%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="32%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:32.7%;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;page-break-after:avoid;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#151;To be issued under the
  2007 Equity Incentive Plan</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="13%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">482,000&nbsp;shares</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">11.39</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(4)</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5,489,980</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">169</font></p>
  </td>
  <td width="0%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:.34%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="32%" valign="top" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:32.7%;">
  <p style="margin:0pt 0pt .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">TOTAL</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="13%" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2,212,260&nbsp;shares</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="13%" colspan="2" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:13.92%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">15,312,470</font></p>
  </td>
  <td width="2%" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:12.94%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">472</font></p>
  </td>
  <td width="0%" valign="bottom" style="border:none;border-bottom:double windowtext 2.25pt;padding:0pt .7pt 0pt 0pt;width:.34%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="font-size:10.0pt;margin:0pt 0pt 12.0pt 20.0pt;text-indent:-20.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Pursuant
to Rule 416(a) under the Securities Act of 1933, as amended, this Registration
Statement shall also cover any additional shares of the Registrant&#146;s Common
Stock that become issuable under the 1999 Equity Incentive Plan or 2007 Equity
Incentive Plan by reason of any stock dividend, stock split, recapitalization
or other similar transaction effected without receipt of consideration that
increases the number of the Registrant&#146;s outstanding shares of Common Stock.</p>

<p style="font-size:10.0pt;margin:0pt 0pt 12.0pt 20.0pt;text-indent:-20.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Estimated
in accordance with Rule&nbsp;457(h) under the Securities Act of 1933, as
amended, solely for the purpose of calculating the registration fee. The price
of $0.96 per share represents the weighted average exercise price for
outstanding options.</p>

<p style="font-size:10.0pt;margin:0pt 0pt 12.0pt 20.0pt;text-indent:-20.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(3)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Estimated
in accordance with Rule&nbsp;457(h) under the Securities Act of 1933, as
amended, solely for the purpose of calculating the registration fee. The price
of $6.84 per share represents the weighted average exercise price for
outstanding options.</p>

<p style="font-size:10.0pt;margin:0pt 0pt 12.0pt 20.0pt;text-indent:-20.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(4)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Estimated
in accordance with Rule&nbsp;457(h) solely for purposes of calculating the
registration fee on the basis of $11.39, which is based on the average of the
high and low prices of PROS Holdings, Inc. Common Stock reported on the New
York Stock Exchange on August 6, 2007.</p>


 <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0pt 0pt 0pt 0pt;"> <p style="border:none;margin:0pt 0pt .0001pt;padding:0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p> </div>
</div><br><hr size="3" width="100%" noshade color="#010101" align="center">

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<br clear="all" style="page-break-before:always;">
<div>


<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PROS HOLDINGS, INC.<br>
REGISTRATION STATEMENT ON FORM S-8</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PART I</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">INFORMATION REQUIRED IN THE PROSPECTUS</font></b></p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt;"><b><font size="2" face="Times New Roman"><font style="font-size:10.0pt;font-weight:bold;">Item&nbsp;1.</font> &#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font></b><b><u style="font-weight:bold;">Plan Information</u></b><b>.*</b></p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt;"><b><font size="2" face="Times New Roman"><font style="font-size:10.0pt;font-weight:bold;">Item&nbsp;2.</font> &#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font></b><b><u style="font-weight:bold;">Registration Information and
Employee Plan Annual Information</u></b><b>.*</b></p>

<div style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><hr size="1" width="160" noshade color="black" align="left" style="width:120.0pt;"></div>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">* The documents
containing the information specified in this Part I will be sent or given to
employees, directors or others as specified by Rule 428(b)(1).&#160; In accordance with the rules and regulations
of the Securities and Exchange Commission (the &#147;Commission &#147;) and the
Introductory Note to Part I of Form S-8, such documents are not being filed
with the Commission either as part of this Registration Statement or as
prospectuses or prospectus supplements pursuant to Rule 424.</font></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PART II</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">INFORMATION
REQUIRED IN THE REGISTRATION STATEMENT</font></b></p>

<p style="margin:0pt 0pt 12.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 3.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <u>Incorporation of
Documents by Reference</u></font></b></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">PROS Holdings, Inc. (the &#147;Company&#148; or the &#147;Registrant&#148;)
hereby incorporates by reference in this Registration Statement the following
documents and information previously filed with the Commission:</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)&#160; The
Registrant&#146;s prospectus filed pursuant to Rule 424(b) under the Securities Act
with the Commission on June&nbsp;28, 2007, relating to the Registrant&#146;s
Registration Statement on Form S-1 (File No.&nbsp;333-141884) and which
includes audited financial statements for the Registrant&#146;s latest fiscal year;
and</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)&#160; The
description of the Registrant&#146;s common stock contained in the Registrant&#146;s
Registration Statement on Form 8-A (File No. 001-33554) filed with the
Commission on June 21, 2007, pursuant to Section 12(b) of the Securities
Exchange Act of 1934, as amended (the &#147;Exchange Act&#148;), including any amendment
or report filed for the purpose of updating such description.</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">All documents subsequently filed with the Commission
by the Registrant pursuant to Sections&nbsp;13(a), 13(c), 14 and 15(d) of the
Exchange Act, on or after the date of this Registration Statement and prior to
the filing of a post-effective amendment to this registration statement which
indicates that all securities offered hereby have been sold or which
deregisters all securities remaining unsold, shall be deemed to be incorporated
by reference in this registration statement and to be a part hereof from the
date of filing of such documents.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><b><font size="2" face="Times New Roman"><font style="font-size:10.0pt;font-weight:bold;">Item 4.</font> &#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Description
of Securities.</font></b></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>


 <p style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p> <br><hr size="3" width="100%" noshade color="#010101" align="center">

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<p style="margin:0pt 0pt 12.0pt;"><b><font size="2" face="Times New Roman"><font style="font-size:10.0pt;font-weight:bold;">Item 5.</font> &#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Interests
of Named Experts and Counsel.</font></b></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The
validity of the Shares of Common Stock offered hereby will be passed upon by
DLA Piper US LLP, Austin, Texas, counsel to the Registrant.</font></p>

<p style="margin:0pt 0pt 12.0pt;page-break-after:avoid;"><b><font size="2" face="Times New Roman"><font style="font-size:10.0pt;font-weight:bold;">Item 6.</font> &#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Indemnification
of Directors and Officers.</font></b></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Section 102(b) of the Delaware General Corporation Law
authorizes a corporation to provide in its certificate of incorporation that a
director of the corporation shall not be personally liable to the corporation
or its stockholders for monetary damages for breach or alleged breach of the
director&#146;s &#147;duty of care.&#148;&#160; While this
statute does not change directors&#146; duty of care, it enables corporations to
limit available relief to equitable remedies such as injunction or
rescission.&#160; The statute has no effect on
a director&#146;s duty of loyalty or liability for acts or omissions not in good
faith or involving intentional misconduct or knowing violations of law, illegal
payment of dividends or stock redemptions or repurchases, or for any
transaction from which the director derives an improper personal benefit.&#160; As permitted by the statute, the Registrant
has adopted provisions in its certificate of incorporation that eliminate to
the fullest extent permissible under Delaware law the personal liability of its
directors to the Registrant and its stockholders for monetary damages for
breach or alleged breach of their duty of care.&#160;
The Registrant&#146;s certificate of incorporation eliminates the personal
liability of each of its directors for monetary damages resulting from any
breach of his fiduciary duty as a director, except for liability:</font></p>

<p style="font-family:Times New Roman;margin:0pt 0pt 12.0pt 108.0pt;text-indent:-18.0pt;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">for any breach of the director&#146;s duty of loyalty to the Registrant or
its stockholders;</font></p>

<p style="font-family:Times New Roman;margin:0pt 0pt 12.0pt 108.0pt;text-indent:-18.0pt;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">for acts or omissions not in good faith or that involve intentional
misconduct or a knowing violation of law;</font></p>

<p style="font-family:Times New Roman;margin:0pt 0pt 12.0pt 108.0pt;text-indent:-18.0pt;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">under Section 174 of the Delaware General Corporation Law regarding
unlawful dividends, stock purchases and redemptions; or</font></p>

<p style="font-family:Times New Roman;margin:0pt 0pt 12.0pt 108.0pt;text-indent:-18.0pt;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">for any transaction from which the director derived an improper
personal benefit.</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Section 145 of the Delaware General Corporation Law
provides that a corporation may indemnify directors and officers as well as
other individuals against expenses, judgments, fines and amounts paid in
settlement actually and reasonably incurred by such person in connection with
any threatened, pending or completed actions, suits or proceedings in which
such person is made a party by reason of such person being or having been a
director, officer, employee or agent to the Registrant. The Delaware General
Corporation Law provides that Section 145 is not exclusive of other rights to
which those seeking indemnification may be entitled under any bylaw, agreement,
vote of stockholders or disinterested directors or otherwise.</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Registrant&#146;s bylaws provide that the Registrant
shall indemnify each director and officer whom it shall have power to indemnify
against any expenses, liabilities, or other matters permitted by the Delaware
General Corporation Law.</font></p>


 <p style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p> <br><hr size="3" width="100%" noshade color="#010101" align="center">

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<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Registrant&#146;s bylaws provide that:</font></p>

<p style="font-family:Times New Roman;margin:0pt 0pt 12.0pt 108.0pt;text-indent:-18.0pt;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">the Registrant is required to indemnify its directors and officers,
subject to limited exceptions in which such directors or officers are adjudged
to be liable to the Registrant;</font></p>

<p style="font-family:Times New Roman;margin:0pt 0pt 12.0pt 108.0pt;text-indent:-18.0pt;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">the Registrant is required to advance expenses, as incurred, to its
directors and officers in connection with a legal proceeding to the fullest
extent permitted by the Delaware General Corporation Law, subject to limited
exceptions; and</font></p>

<p style="font-family:Times New Roman;margin:0pt 0pt 12.0pt 108.0pt;text-indent:-18.0pt;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">the rights conferred in the bylaws are not exclusive.</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">In addition, the Registrant is entering into indemnity
agreements with each of its current directors and officers. These agreements
provide for the indemnification of the Registrant&#146;s officers and directors for
all expenses and liabilities incurred in connection with any action or
proceeding brought against them by reason of the fact that they are or were
agents of the Registrant. At present, there is no pending litigation or
proceeding involving a director, officer or employee of the Registrant
regarding which indemnification is sought, nor is the Registrant aware of any
threatened litigation that may result in claims for indemnification.</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Registrant also has obtained directors&#146; and
officers&#146; insurance to cover its directors, officers and some of the Registrant&#146;s
employees for liabilities, including coverage for public securities matters.</font></p>

<p style="margin:0pt 0pt 12.0pt;page-break-after:avoid;"><b><font size="2" face="Times New Roman"><font style="font-size:10.0pt;font-weight:bold;">Item 7. </font>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Exemption
from Registration Claimed.</font></b></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>

<p style="margin:0pt 0pt 12.0pt;page-break-after:avoid;"><b><font size="2" face="Times New Roman"><font style="font-size:10.0pt;font-weight:bold;">Item 8. </font>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Exhibits.</font></b></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;font-family:Times New Roman;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p align="left" style="font-size:8.0pt;font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:left;"><!-- SET mrlHTMLTableLeft --><!-- SET mrlNoTableShading -->Exhibit<br>
  Number</p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Description of Documents</font></b></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="border:none;padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.1</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1999 Equity Incentive Plan , as amended to date (which
  is incorporated h erein by reference to Exhibit&nbsp;10.2 to the Registrant&#146;s
  Registration Statement on Form&nbsp;S-1 (Registration No.&nbsp;333-141884),
  as amended, (&#147;Registrant&#146;s Form&nbsp;S-1&#148;)).</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.2</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2007 Equity Incentive Plan (which is incorporated
  herein by reference to Exhibit 10.3 to the Registrant&#146;s Form S-1).</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5.1</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Opinion of DLA Piper US LLP</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.1</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent of PricewaterhouseCoopers LLP, Independent
  Registered Public Accounting Firm</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.2</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent of DLA Piper US LLP (included in
  Exhibit&nbsp;5.1)</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45" valign="top" style="padding:0pt .7pt 0pt 0pt;width:34.0pt;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">24.1</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:12.0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0pt .7pt 0pt 0pt;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Power of Attorney (included as part of the signature
  page of this Registration Statement).</font></p>
  </td>
 </tr>
</table>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>


 <p style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p> <br><hr size="3" width="100%" noshade color="#010101" align="center">

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<p style="margin:0pt 0pt 12.0pt;"><b><font size="2" face="Times New Roman"><font style="font-size:10.0pt;font-weight:bold;">Item 9. </font>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Undertakings.</font></b></p>

<p style="font-family:Times New Roman;margin:0pt 0pt 12.0pt 54.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">The undersigned Registrant hereby
undertakes:</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; To
file, during any period in which offers or sales are being made, a post-effective
amendment to this registration statement:</font></p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt 108.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(i)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>To
include any prospectus required by Section&nbsp;10(a)(3) of the Securities Act
of 1933, as amended (the &#147;Securities Act&#148;);</p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt 108.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(ii)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>To
reflect in the prospectus any facts or events arising after the effective date
of the Registration Statement (or the most recent post-effective amendment
thereof) which, individually or in the aggregate, represent a fundamental
change in the information set forth in the Registration Statement.
Notwithstanding the foregoing, any increase or decrease in volume of securities
offered (if the total dollar value of securities offered would not exceed that
which was registered) and any deviation from the low or high end of the
estimated maximum offering range may be reflected in the form of prospectus
filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than a 20 percent change in the
maximum aggregate offering price set forth in the &#147;Calculation of Registration
Fee&#148; table in the effective Registration Statement; and</p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt 108.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(iii)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>To
include any material information with respect to the plan of distribution not
previously disclosed in the registration statement or any material change to
such information in the registration statement;</p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">provided,
however</font></i>, that paragraphs (a)(1)(i)&nbsp;and
(a)(l)(ii)&nbsp;do not apply if the information required to be included in a
post-effective amendment by those paragraphs is contained in periodic reports
filed with or furnished to the Commission by the Registrant pursuant to
Section&nbsp;13 or Section&nbsp;15(d) of the Exchange Act that are incorporated
by reference in the registration statement;</p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; That,
for the purpose of determining any liability under the Securities Act, each
such post-effective amendment shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(3)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; To
remove from registration by means of a post-effective amendment any of the
securities being registered which remain unsold at the termination of the
offering.</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; The
undersigned Registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act, each filing of the Registrant&#146;s annual
report pursuant to Section&nbsp;13(a) or Section 15(d) of the Exchange Act
(and, where applicable, each filing of an employee benefit plan&#146;s annual report
pursuant to Section 15(d) of the Exchange Act) that is incorporated by
reference in the registration statement shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(c)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Insofar
as indemnification for liabilities arising under the Securities Act may be
permitted to directors, officers and controlling persons of the Registrant
pursuant to the provisions described under &#147;Item 6 &#151; Indemnification of
Directors and Officers&#148; above, or otherwise, the Registrant has been advised
that in the opinion of the Commission such indemnification is against public
policy as expressed in the Securities Act and is, therefore,
unenforceable.&#160; In the event that a claim
for indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.</font></p>


 <p style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5</font></p>
</div><br><hr size="3" width="100%" noshade color="#010101" align="center">

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<br clear="all" style="page-break-before:always;">
<div style="font-family:Times New Roman;">

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SIGNATURES</font></b></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities Act of
1933, the Registrant certifies that it has reasonable grounds to believe that
it meets all of the requirements for filing on Form S-8 and has duly caused
this Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in Houston, Texas, on this 8th day of August, 2007.</font></p>

<div align="center">

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="48%" colspan="2" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.78%;">
  <p align="center" style="font-size:10.0pt;margin:0pt 0pt .0001pt;text-align:center;"><!-- SET mrlNoTableShading --></p>
  </td>
  <td width="51%" colspan="3" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:51.22%;">
  <p style="margin:0pt 0pt .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PROS HOLDINGS, INC.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="48%" colspan="2" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.78%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.46%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" colspan="2" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.78%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="24%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:24.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="24%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:24.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.46%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By</font></p>
  </td>
  <td width="24%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:24.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;/s/ Albert E. Winemiller</font></p>
  </td>
  <td width="24%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:24.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="48%" colspan="2" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.78%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.46%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" colspan="2" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.78%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;Albert E. Winemiller</font></p>
  </td>
 </tr>
 <tr>
  <td width="48%" colspan="2" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.78%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.46%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" colspan="2" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.78%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;President and Chief Executive Officer</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="182" style="border:none;"></td>
  <td width="183" style="border:none;"></td>
  <td width="18" style="border:none;"></td>
  <td width="182" style="border:none;"></td>
  <td width="182" style="border:none;"></td>
 </tr>
</table>

</div>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

</div><br><hr size="3" width="100%" noshade color="#010101" align="center">

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<br clear="all" style="page-break-before:always;">
<div style="font-family:Times New Roman;">

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">POWER OF ATTORNEY</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">KNOW ALL PERSONS BY THESE PRESENTS that each
individual whose signature appears below constitutes and appoints
Albert&nbsp;E. Winemiller and Charles&nbsp;H. Murphy and each of them, as his
true and lawful attorney-in-fact and agent with full power of substitution, for
him in any and all capacities, to sign any and all amendments to this
Registration Statement on Form S-8, and to file the same, with all exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, granting unto each said attorney-in-fact and agent full
power and authority to do and perform each and every act and thing requisite
and necessary to be done in connection therewith, as fully for all intents and
purposes as he might or could do in person, hereby ratifying and confirming all
that each said attorney-in-fact and agent, or his substitute, may lawfully do
or cause to be done by virtue hereof.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities Act of
1933, as amended, this Registration Statement has been signed by the following
persons in the capacities and on the dates indicated: </font></p>

<div align="center">

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="31%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="font-size:8.0pt;font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><!-- SET mrlNoTableShading -->Name</p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="31%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Title</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="31%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Date</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Albert E. Winemiller</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:24.0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chairman, President and
  Chief </font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">August
  8, 2007</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="top" style="border:none;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Albert E.
  Winemiller</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Executive Officer (principal executive officer)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Charles H. Murphy</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:24.0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Executive Vice
  President and</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">August
  8, 2007</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="top" style="border:none;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Charles H.
  Murphy</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chief Financial Officer (principal financial and
  accounting officer)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Kurt R. Jaggers</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:24.0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">August
  8, 2007</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Kurt R. Jaggers</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Harry S. Gruner</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:24.0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">August
  8, 2007</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Harry S. Gruner</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Greg B. Petersen</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:24.0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">August
  8, 2007</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Greg B. Petersen</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Timothy V. Williams</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:24.0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">August
  8, 2007</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Timothy V.
  Williams</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Mariette M. Woestemeyer</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:24.0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">August
  8, 2007</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Mariette M.
  Woestemeyer</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Ronald F. Woestemeyer</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:24.0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:24.0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">August
  8, 2007</font></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="bottom" style="border:none;padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Ronald&nbsp;F.
  Woestemeyer</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:31.74%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

</div>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

</div><br><hr size="3" width="100%" noshade color="#010101" align="center">

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<br clear="all" style="page-break-before:always;">
<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXHIBIT INDEX</font></b></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="61" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in 0in;width:46.0pt;">
  <p align="left" style="font-size:8.0pt;font-weight:bold;line-height:8.0pt;margin:0in 0in .0001pt;text-align:left;"><!-- SET mrlHTMLTableLeft --><!-- SET mrlNoTableShading -->Exhibit No.</p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="61" valign="top" style="border:none;padding:0in .7pt 0in 0in;width:46.0pt;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.1</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="margin:0in 20.0pt .0001pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1999 Equity Incentive
  Plan , as amended to date (which is incorporated h erein by reference to
  Exhibit&nbsp;10.2 to the Registrant&#146;s Registration Statement on Form&nbsp;S-1
  (Registration No.&nbsp;333-141884), as amended, (&#147;Registrant&#146;s
  Form&nbsp;S-1&#148;)).</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="61" valign="top" style="padding:0in .7pt 0in 0in;width:46.0pt;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="61" valign="top" style="padding:0in .7pt 0in 0in;width:46.0pt;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.2</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2007 Equity Incentive Plan (which is incorporated
  herein by reference to Exhibit 10.3 to the Registrant&#146;s Form S-1).</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="61" valign="top" style="padding:0in .7pt 0in 0in;width:46.0pt;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="61" valign="top" style="padding:0in .7pt 0in 0in;width:46.0pt;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5.1</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Opinion of DLA Piper US LLP</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="61" valign="top" style="padding:0in .7pt 0in 0in;width:46.0pt;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="61" valign="top" style="padding:0in .7pt 0in 0in;width:46.0pt;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.1</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent of PricewaterhouseCoopers LLP, Independent
  Registered Public Accounting Firm</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="61" valign="top" style="padding:0in .7pt 0in 0in;width:46.0pt;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
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  <td width="61" valign="top" style="padding:0in .7pt 0in 0in;width:46.0pt;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.2</font></p>
  </td>
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  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent of DLA Piper US LLP (i ncluded in
  Exhibit&nbsp;5.1)</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="61" valign="top" style="padding:0in .7pt 0in 0in;width:46.0pt;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
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  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
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  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">24.1</font></p>
  </td>
  <td width="16" valign="bottom" style="padding:0in .7pt 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td valign="bottom" style="padding:0in .7pt 0in 0in;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Power of Attorney (included as part of the signature
  page of this Registration Statement).</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

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<p align="right" style="margin:0pt 0pt 12.0pt;text-align:right;text-indent:36.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXHIBIT 5.1</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Opinion of DLA Piper US LLP</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">August 8, 2007</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">PROS
Holdings, Inc.<br>
3100 Main Street, Suite 900<br>
Houston, TX 77002</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:23.1pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">RE: REGISTRATION STATEMENT ON FORM S-8</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Ladies and Gentlemen:</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">As legal counsel for PROS Holdings, Inc., a Delaware
corporation (the &#147;<u>Company</u>&#148;), we are rendering this opinion in connection
with the registration on Form S-8 (the &#147;<u>Registration Statement</u>&#148;) under
the Securities Act of 1933, as amended, of up to&nbsp;2,212,260 shares (the &#147;<u>Shares</u>&#148;)
of Common Stock, $0.001 par value, of the Company which may be issued pursuant
to the awards granted under the Company&#146;s 1999 Stock Incentive Plan and the
2007 Stock Incentive Plan (together, the &#147;<u>Plans</u>&#148;).</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">We have examined all instruments, documents and
records which we deemed relevant and necessary for the basis of our opinion
hereinafter expressed.&nbsp; In such examination, we have assumed the
genuineness of all signatures and the authenticity of all documents submitted
to us as originals and the conformity to the originals of all documents
submitted to us as copies.&nbsp; We are admitted to practice only in the State
of Texas and we express no opinion concerning any law other than the law of the
State of Texas, the corporation laws of the State of Delaware and the federal
law of the United States.&nbsp; As to matters of Delaware corporation law, we
have based our opinion solely upon our examination of such laws and the rules
and regulations of the authorities administering such laws, all as reported in
standard, unofficial compilations.&nbsp; We have not obtained opinions of counsel
licensed to practice in jurisdictions other than the State of Texas.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Based on such examination, we are of the opinion that
the Shares which may be issued under the Plans are duly authorized shares of
the Company&#146;s Common Stock, and, when issued against receipt of the
consideration therefore in accordance with the provisions of the Plans, will be
validly issued, fully paid and nonassessable.&nbsp; We hereby consent to the
filing of this opinion as an exhibit to the Registration Statement referred to
above and the use of our name wherever it appears in such Registration
Statement.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This opinion letter is given to you solely for use in
connection with the issuance of the Shares in accordance with the Registration
Statement and is not to be relied on for any other purpose.&#160; Our opinion is expressly limited to the
matters set forth above, and we render no opinion, whether by implication or
otherwise, as to any other matters relating to the Company, the Shares or the
Registration Statement.</font></p>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div align="center">

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
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  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="25%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:25.0%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Very truly yours,</font></p>
  </td>
  <td width="25%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:25.0%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
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  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
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  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="25%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:25.0%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
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  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
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  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="25%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:25.0%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="25%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:25.0%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ DLA PIPER US LLP</font></p>
  </td>
  <td width="25%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:25.0%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
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  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="25%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:25.0%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="25%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:25.0%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">DLA PIPER US LLP</font></p>
  </td>
  <td width="25%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:25.0%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
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<p align="right" style="margin:0pt 0pt 12.0pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXHIBIT
23.1</font></b></p>

<p style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Consent of Independent Registered
Public Accounting Firm</font></b></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">We hereby consent to the incorporation by reference in
this Registration Statement on Form S-8 of our report dated January 26, 2007,
except for Note 3, as to which the date is April 3, 2007, relating to the
financial statements and financial statement schedule of PROS Holdings, Inc.,
which is included in its Registration Statement on Form S-1 (File
No.&nbsp;333-141884), filed with the Securities and Exchange Commission.</font></p>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ PricewaterhouseCoopers LLP</font></p>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Houston, Texas</font></p>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">August 8, 2007</font></p>

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