<SUBMISSION>
<ACCESSION-NUMBER>0000950137-05-010986
<TYPE>S-8 POS
<PUBLIC-DOCUMENT-COUNT>3
<FILING-DATE>20050902
<DATE-OF-FILING-DATE-CHANGE>20050902
<EFFECTIVENESS-DATE>20050902
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>CDW CORP
<CIK>0000899171
<ASSIGNED-SIC>5961
<IRS-NUMBER>363310735
<STATE-OF-INCORPORATION>IL
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>S-8 POS
<ACT>33
<FILE-NUMBER>333-120260
<FILM-NUMBER>051068562
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>200 N MILWAUKEE AVE
<CITY>VERNON HILLS
<STATE>IL
<ZIP>60061
<PHONE>8474656000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>200 N MILWAUKEE AVE
<CITY>VERNON HILLS
<STATE>IL
<ZIP>60061
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>CDW COMPUTER CENTERS INC
<DATE-CHANGED>19930322
</FORMER-COMPANY>
</FILER>
<DOCUMENT>
<TYPE>S-8 POS
<SEQUENCE>1
<FILENAME>c98243sv8pos.htm
<DESCRIPTION>POST-EFFECTIVE AMENDMENT TO REGISTRATION STATEMENT
<TEXT>
<HTML>
<HEAD>
<TITLE>sv8pos</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="left"><FONT size="1">

</FONT></DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">As filed with the Securities and Exchange Commission on September&nbsp;2, 2005
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="right" style="font-size: 10pt; margin-top: 12pt">Registration No.&nbsp;333-120260
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>Post-Effective Amendment No.&nbsp;1<BR>
to</B>
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>REGISTRATION STATEMENT<BR>
Under<BR>
The Securities Act of 1933</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
</DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>CDW Corporation</B>
</DIV>

<DIV align="center" style="font-size: 10pt">(Exact name of registrant as specified in its charter)</DIV>


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="47%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><B>Illinois</B><BR>
(State or other jurisdiction of<BR>
incorporation or organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>36-3310735</B><BR>
(I.R.S. Employer Identification No.)</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>200 N. Milwaukee Ave.<BR>
Vernon Hills, Illinois</B><BR>
(Address of principal executive offices)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>60061</B><BR>
(Zip Code)</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>2004 Non-Employee Director Equity Compensation Plan<BR>
Inducement Stock Grants Made to Newly Hired Employees</B><BR>
(Full title of the plans)
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>Christine A. Leahy</B><BR>
Vice President, General Counsel and Corporate Secretary<BR>
CDW Corporation<BR>
200 N. Milwaukee Ave.<BR>
Vernon Hills, Illinois 60061<BR>
(847)&nbsp;465-6000<BR>
(Name, address, and telephone number,<BR>
including area code, of agent for service)
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>


<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>
<!-- PAGEBREAK -->
<P><HR noshade><P>

<DIV style="font-family: 'Times New Roman',Times,serif">




<!-- TOC -->
<A name="toc"><DIV align="CENTER" style="page-break-before:always"><U><B>TABLE OF CONTENTS</B></U></DIV></A>

<P><CENTER>
<TABLE border="0" width="90%" cellpadding="0" cellspacing="0">
<TR>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="76%"></TD>
</TR>
<TR><TD colspan="9"><A HREF="#000">POST EFFECTIVE AMENDMENT NO. 1</A></TD></TR>
<TR><TD colspan="9"><A HREF="#001">PART II INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</A></TD></TR>
<TR><TD colspan="9"><A HREF="#002">ARTICLE VI INDEMNIFICATION OF DIRECTORS, EMPLOYEES AND AGENTS</A></TD></TR>
<TR><TD colspan="9"><A HREF="#003">SIGNATURES</A></TD></TR>
<TR><TD colspan="9"><A HREF="#004">EXHIBIT INDEX</A></TD></TR>
<TR><TD colspan="9"><A HREF="c98243exv5.htm">Opinion of Sidley Austin Brown & Wood LLP</A></TD></TR>
<TR><TD colspan="9"><A HREF="c98243exv23w1.htm">Consent of PricewaterhouseCoopers LLP</A></TD></TR>
</TABLE>
</CENTER>
<!-- /TOC -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>


<DIV align="left"><FONT size="1">

</FONT></DIV>

<!-- link1 "POST EFFECTIVE AMENDMENT NO. 1 " -->
<DIV align="left"><A NAME="000"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>POST EFFECTIVE AMENDMENT NO. 1</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This Post-Effective Amendment No.&nbsp;1 to the Registration Statement on Form S-8, File No.
333-120260 (the &#147;Registration Statement&#148;), of CDW Corporation, an Illinois corporation (the
&#147;Company&#148;), is being filed to add to the plans covered by the Registration Statement grants
(&#147;Inducement Grants&#148;) of shares of the Company&#146;s common stock, par value $0.01 per share (the
&#147;Common Stock&#148;), to be made by the Company from time to time to newly hired employees as an
inducement to accepting employment with the Company.
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<!-- link1 "PART II INFORMATION REQUIRED IN THE REGISTRATION STATEMENT" -->
<DIV align="left"><A NAME="001"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II<BR>
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3. Incorporation of Documents by Reference</B>.
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents heretofore filed with the Securities and Exchange Commission (the
&#147;Commission&#148;) by the Company are incorporated herein by reference:
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Company&#146;s Annual Report on Form 10-K for the fiscal year ended December&nbsp;31,
2004;</TD>



</TR>
<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Company&#146;s Quarterly Report on Form 10-Q for the quarterly period ended March
31, 2005;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Company&#146;s Quarterly Report on Form 10-Q for the quarterly period ended June
30, 2005;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Company&#146;s Current Reports on Form 8-K filed on February&nbsp;2, 2005, February&nbsp;24,
2005, April&nbsp;22, 2005, April&nbsp;29, 2005 and July&nbsp;7, 2005; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The description of the Common Stock contained in the Company&#146;s registration
statement on Form S-3/A filed under the Securities Act of 1933, as amended (&#147;Securities
Act&#148;), on March&nbsp;18, 2004, including any amendments or reports filed for the purpose of
updating such descriptions.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All documents filed by the Company with the Commission pursuant to Sections&nbsp;13(a), 13(c), 14
and 15(d) of the Securities Exchange Act of 1934, as amended (&#147;Exchange Act&#148;), 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 then remaining unsold, shall be deemed to be incorporated by reference
into this registration statement and to be a part hereof from the respective dates of filing of
such documents (such documents, and the documents listed above, being hereinafter referred to as
&#147;Incorporated Documents&#148;).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any statement contained in an Incorporated Document shall be deemed to be modified or
superseded for purposes of this registration statement to the extent that a statement contained
herein or in any other subsequently-filed Incorporated Document modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this registration statement.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4. Description of Securities</B>.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;5. Interests of Named Experts and Counsel</B>.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6. Indemnification of Directors and Officers</B>.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;8.75 of the Illinois Business Corporation Act, among other things, permits
corporations to indemnify directors, officers, employees and agents against any expense, liability
or loss to which they may become subject, or which they may incur as a result of being or having
been a director, officer, employee or agent of the corporation. In reliance on this statutory
provision, our Restated Articles of Incorporation and Amended and Restated By-Laws provide that we
are required to indemnify our directors, officers, employees and agents to the maximum extent
permitted by law. We also maintain directors&#146; and officers&#146; liability insurance, which covers
liabilities under the federal securities laws.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The indemnification provisions applicable to the directors of the Company are set out in
Articles Sixth and Seventh of the Restated Articles of Incorporation and Article&nbsp;VI of the Amended
and Restated By-Laws, respectively, as follows:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">RESTATED ARTICLES OF INCORPORATION:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SIXTH: The Corporation shall, to the full extent permitted by Section&nbsp;8.75 of the Illinois
Business Corporation Act, as amended from time to time, indemnify all persons whom it may indemnify
pursuant thereto.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SEVENTH: No director of the Corporation shall be personally liable to the Corporation or its
shareholders for monetary damages, for breach of his fiduciary duty as a director; provided, that
nothing herein shall be construed to eliminate or limit the liability of a director (a)&nbsp;for any
breach of the director&#146;s duty of loyalty to the Corporation or its shareholders, (b)&nbsp;for acts or
omissions not in good faith or involving intentional misconduct or knowing violation of law, (c)
under Section&nbsp;8.65 of the Illinois Business Corporation Act, as amended, or (d)&nbsp;for any transaction
from which the director derived an improper personal benefit.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt">AMENDED AND RESTATED BY-LAWS:
</DIV>

<!-- link1 "ARTICLE VI INDEMNIFICATION OF DIRECTORS, EMPLOYEES AND AGENTS" -->
<DIV align="left"><A NAME="002"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt">ARTICLE VI
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 12pt">INDEMNIFICATION OF<BR>
DIRECTORS, EMPLOYEES AND AGENTS
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each person who at any time is or shall have been a director or officer of the corporation, or
is or shall have been serving at the request of the corporation as a director, officer, employee or
agent of another corporation, partnership, joint venture, trust or other
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="left" style="font-size: 10pt; margin-top: 6pt">enterprise, shall be
indemnified by the corporation in accordance with and to the full extent permitted by the law of
the State of Illinois as in effect at the time of adoption of this By-law or as amended from time
to time. The foregoing right of indemnification shall not be deemed exclusive of any other rights
to which a person seeking indemnification may be entitled under any By-law, agreement, vote of
shareholders or disinterested directors or otherwise. Expenses incurred in defending a civil or
criminal action, suit or proceeding may be paid by the corporation in advance of the final
disposition of such action, suit or proceeding as authorized by the Board of Directors in the
specific case upon receipt of an undertaking by or on behalf of the director, officer, employee or
agent to repay such amount unless it shall ultimately be determined that he is entitled to be
indemnified by the corporation. If authorized by the Board of Directors, the corporation may
purchase and maintain insurance on behalf of any person to the full extent permitted by the law of
the State of Illinois as in effect at the time of the adoption of this By-law or as amended from
time to time.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;7. Exemption from Registration Claimed</B>.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8. Exhibits</B>.
</DIV>


<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="90%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Exhibit</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Description</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Restated Articles of Incorporation of the Registrant are
incorporated herein by reference to Exhibit&nbsp;3(a) to the
Registrant&#146;s Quarterly Report on Form&nbsp;10-Q (File No.&nbsp;0-21796) for
the quarter ended June&nbsp;30, 2003 filed with the Securities and
Exchange Commission on August&nbsp;13, 2003.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated By-Laws of the Registrant are incorporated
herein by reference to Exhibit&nbsp;3 to the Registrant&#146;s Quarterly
Report on Form&nbsp;10-Q (File No.&nbsp;0-21796) for the quarter ended March
31, 2004 filed with the Securities and Exchange Commission on May
10, 2004.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">The Company&#146;s 2004 Non-Employee Director Equity Compensation Plan
is incorporated herein by reference to Annex A to the Registrant&#146;s
Definitive Proxy Statement on Schedule&nbsp;14A filed with the
Securities and Exchange Commission on April&nbsp;16, 2004.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Sidley Austin Brown &#038; Wood LLP.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of PricewaterhouseCoopers LLP.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Sidley Austin Brown &#038; Wood LLP is contained in Exhibit&nbsp;5.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24**
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Powers of Attorney.</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">*</TD>
    <TD>&nbsp;</TD>
    <TD>Filed herewith.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>


<TR valign="top">
    <TD nowrap align="left">**</TD>
    <TD>&nbsp;</TD>
    <TD>Previously filed.</TD>
</TR>

<TR><TD><FONT size="1">

</FONT></TD></TR>

</TABLE>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">






<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;9. Undertakings</B>.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;The Company hereby undertakes:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;To file, during any period in which offers or sales are being made, a post-effective
amendment to this registration statement:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) To include any prospectus required by Section&nbsp;10(a)(3) of the Securities Act;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) 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; and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) 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;
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">provided, however, that paragraphs (i)&nbsp;and (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 15(d) of
the Exchange Act that are incorporated by reference in the registration statement.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;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 <I>bona fide </I>offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;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.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;For purposes of determining any liability under the Securities Act, each filing of the
Company&#146;s annual report pursuant to Section 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 <I>bona fide </I>offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;Insofar as indemnification for liabilities arising under the Securities Act may be
permitted to directors, officers and controlling persons of the Company pursuant to the provisions
set forth above, or otherwise, the Company 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. In the event that a claim for indemnification against such liabilities (other than
the payment by the Company of expenses incurred or paid by a director, officer or controlling
person of the Company 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 Company 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.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link1 "SIGNATURES" -->
<DIV align="left"><A NAME="003"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Company 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 Post-Effective Amendment No.&nbsp;1 to be signed on its behalf by the undersigned,
thereunto duly authorized, in the Village of Vernon Hills, State of Illinois, on the 2nd day of
September, 2005.
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left"><B>CDW CORPORATION</B><BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>

<TR><TD><FONT size="1">

</FONT></TD></TR>

<TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ Christine A. Leahy
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Christine A. Leahy&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Vice President, General Counsel and Secretary&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>

<TR><TD><FONT size="1">

</FONT></TD></TR>

<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>


<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>
<P>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment No.&nbsp;1 has
been signed by the following persons in the capacities and on the dates indicated:
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>
<P>
<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="2%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
    <TD width="70%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
John A. Edwardson
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Chairman of the Board and Chief Executive Officer<BR>
(Principal Executive Officer)</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Barbara A. Klein
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Senior Vice President and Chief Financial Officer<BR>
(Principal Financial Officer)</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Sandra M. Rouhselang
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Vice President and Controller<BR>
(Principal Accounting Officer)</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Michelle L. Collins
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Casey G. Cowell
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Daniel S. Goldin
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">&nbsp;</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Thomas J. Hansen
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Donald P. Jacobs
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="2%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
    <TD width="70%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">&nbsp;</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Stephan A. James
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Michael P. Krasny
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Terry L. Lengfelder
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Susan D. Wellington
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
<DIV align="center">*</DIV>
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Brian E. Williams
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="left" nowrap valign="top">*By:</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
/s/ Christine A. Leahy
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Christine A. Leahy, as<BR>
Attorney-in-Fact pursuant<BR>
to Power of Attorney<BR>
dated November 5, 2004</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- link1 "EXHIBIT INDEX " -->
<DIV align="left"><A NAME="004"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXHIBIT INDEX</B>
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="90%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Exhibit</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Description</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Restated Articles of Incorporation of the Registrant are
incorporated herein by reference to Exhibit&nbsp;3(a) to the
Registrant&#146;s Quarterly Report on Form&nbsp;10-Q (File No.&nbsp;0-21796) for
the quarter ended June&nbsp;30, 2003 filed with the Securities and
Exchange Commission filed on August&nbsp;13, 2003.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated By-Laws of the Registrant are incorporated
herein by reference to Exhibit&nbsp;3 to the Registrant&#146;s Quarterly
Report on Form&nbsp;10-Q (File No.&nbsp;0-21796) for the quarter ended March
31, 2004 filed with the Securities and Exchange Commission filed on
May&nbsp;10, 2004.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">The Company&#146;s 2004 Non-Employee Director Equity Compensation Plan
is incorporated herein by reference to Annex A to the Registrant&#146;s
Definitive Proxy Statement on Schedule&nbsp;14A filed with the
Securities and Exchange Commission on April&nbsp;16, 2004.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Sidley Austin Brown &#038; Wood LLP.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of PricewaterhouseCoopers LLP.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Sidley Austin Brown &#038; Wood LLP is contained in Exhibit&nbsp;5.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24**
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Powers of Attorney.</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">*</TD>
    <TD>&nbsp;</TD>
    <TD>Filed herewith.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>


<TR valign="top">
    <TD nowrap align="left">**</TD>
    <TD>&nbsp;</TD>
    <TD>Previously filed.</TD>
</TR>

<TR><TD><FONT size="1">

</FONT></TD></TR>

</TABLE>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5
<SEQUENCE>2
<FILENAME>c98243exv5.htm
<DESCRIPTION>OPINION OF SIDLEY AUSTIN BROWN & WOOD LLP
<TEXT>
<HTML>
<HEAD>
<TITLE>exv5</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">






<DIV align="right" style="font-size: 10pt; margin-top: 12pt"><B>EXHIBIT 5</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">&#091;Sidley Austin Brown &#038; Wood LLP Letterhead&#093;
</DIV>


<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="center" style="font-size: 10pt; margin-top: 18pt">September&nbsp;2, 2005
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">CDW Corporation<BR>
200 N. Milwaukee Ave.<BR>
Vernon Hills, Illinois 60061

</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="CENTER">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="36%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="90%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Re:
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">CDW Corporation<BR>
Post-Effective Amendment No.&nbsp;1 to<BR>
<U>Registration Statement on Form&nbsp;S-8</U></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt">Ladies and Gentlemen:
</DIV>


<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We refer to the Post-Effective Amendment No.&nbsp;1 (the &#147;Post-Effective Amendment&#148;) to the
Registration Statement on Form S-8, File No.&nbsp;333-120260 (the &#147;Registration Statement&#148;), being filed
by CDW Corporation, an Illinois corporation (the &#147;Company&#148;), with the Securities and Exchange
Commission (the &#147;Commission&#148;) under the Securities Act of 1933, as amended (the &#147;Securities Act&#148;),
relating to, among other things, issuances of shares of the Company&#146;s common stock, par value $.01
per share, pursuant to grants (the &#147;Inducement Grants&#148;) to be made by the Company from time to time
to newly hired employees as an inducement to accepting employment with the Company. This opinion
letter supplements our opinion letter, dated November&nbsp;5, 2004 and addressed to the Company, which
was filed as Exhibit&nbsp;5 to the Registration Statement, and related to issuances of Common Stock to
be made under the Company&#146;s 2004 Non-Employee Director Equity Compensation Plan.
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In rendering this opinion letter, we have examined and relied upon a copy of the Registration
Statement, the Post-Effective Amendment, the Restated Articles of Incorporation of the Company and
the Amended and Restated By-Laws of the Company. We have also examined and relied upon originals,
or copies of originals certified to our satisfaction, of such agreements, documents, certificates
and statements of governmental officials and other instruments, and have examined such questions of
law and have satisfied ourselves as to such matters of fact, as we have considered relevant and
necessary as a basis for this opinion letter. We have assumed the authenticity of all documents
submitted to us as originals, the genuineness of all signatures, the legal capacity of all natural
persons and the conformity with the original documents of any copies thereof submitted to us for
our examination.
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Based upon the foregoing, we are of the opinion that:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.&nbsp;The Company is duly incorporated and validly existing under the laws of the State of
Illinois.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.&nbsp;Shares of Common Stock to be issued as an Inducement Grant will be legally issued, fully
paid and non-assessable when (i)&nbsp;the Post-Effective Amendment has become effective under the
Securities Act, (ii)&nbsp;the Company&#146;s Board of Directors or a duly authorized committee thereof shall
have duly adopted final resolutions authorizing the issuance and sale of the Shares pursuant to
such Inducement Grant and (iii)&nbsp;a certificate representing such Shares shall have been duly
executed, countersigned and registered and duly delivered to the person entitled thereto against
receipt of the agreed consideration therefor in accordance with the terms of the Inducement Grant.
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We do not find it necessary for the purposes of this opinion letter to cover, and accordingly
we express no opinion as to, the application of the securities or blue sky laws of the various
states or the District of Columbia to the issuance and sale of the Shares.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This opinion letter is limited to the laws of the State of Illinois.
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We hereby consent to the filing of this opinion letter as an exhibit to the Post-Effective
Amendment and to all references to our firm included in or made a part of the Post-Effective
Amendment. In giving such consent, we do not thereby admit that we are within the category of
persons from whom consent is required by Section&nbsp;7 of the Act or the related rules promulgated by
the Commission.
</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">Very truly yours,<BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">/s/ Sidley Austin Brown &#038; Wood LLP
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>

</TABLE>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>c98243exv23w1.htm
<DESCRIPTION>CONSENT OF PRICEWATERHOUSECOOPERS LLP
<TEXT>
<HTML>
<HEAD>
<TITLE>exv23w1</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="right" style="font-size: 10pt; margin-top: 12pt"><B>EXHIBIT 23.1</B>
</DIV>

<DIV align="left"><FONT size="1">

</FONT></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><U>CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM</U>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">We hereby consent to the incorporation by reference in this Post-Effective Amendment No.&nbsp;1 to the
Registration Statement on Form S-8 of our report dated March&nbsp;15, 2005 relating to the financial
statements, financial statement schedule, management&#146;s assessment of the effectiveness of internal
control over financial reporting and the effectiveness of internal control over financial
reporting, of CDW Corporation, which appears in CDW Corporation&#146;s Annual Report on Form 10-K for
the year ended December&nbsp;31, 2004.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">/s/ PricewaterhouseCoopers LLP

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">PricewaterhouseCoopers LLP<BR>
Chicago, IL<BR>
September&nbsp;2, 2005

</DIV>
<DIV align="left"><FONT size="1">

</FONT></DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>


</BODY>
</HTML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
