<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>4
<FILENAME>ex3-sc13d_opentext.txt
<DESCRIPTION>EXHIBIT 3
<TEXT>

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683715106                                                         Page 19 of 20
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EXHIBIT 3
to SCHEDULE 13D


                         GENERAL ATLANTIC PARTNERS, LLC
                                3 PICKWICK PLAZA
                               GREENWICH, CT 06830

                                 January 4, 2004

                                POWER OF ATTORNEY

The undersigned, General Atlantic Partners, LLC, a Delaware limited liability
company, with its principal office at 3 Pickwick Plaza, Greenwich, Connecticut,
United States of America (the "Limited Liability Company"), by its Executive
Managing Member, Steven A. Denning, a U.S. citizen, of full legal age, hereby
constitutes and appoints Thomas J. Murphy, a U.S. citizen, of full legal age,
its true and lawful attorney-in-fact and agent, in any and all capacities, to
execute and deliver any and all documents and instruments and to make any
governmental filings on behalf of the Limited Liability Company as fully to all
intents and purposes as a Managing Member of the Limited Liability Company might
or could do in person, hereby ratifying and confirming all that said
attorney-in-fact may lawfully do or cause to be done. This power of attorney
shall expire on January 4, 2005.


                                     GENERAL ATLANTIC PARTNERS, LLC


                                     By:  /s/ Steven A. Denning
                                          -----------------------------------
                                          Name:   Steven A. Denning
                                          Title:  Executive Managing Member




STATE OF CONNECTICUT    )
                        : ss.
COUNTY OF FAIRFIELD     )


On the 4th day of January 2004, before me personally came Steven A. Denning, to
me known, and known to me to be the individual described in, and who executed
the foregoing document, and he acknowledged to me that he executed the same.


                                     /s/ Natalie J. Wagner
                                     --------------------------------
                                     Notary Public



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