(GEAC LOGO)                                                      (COMSHARE LOGO)

                                                                    NEWS RELEASE


                   GEAC EXTENDS SUBSEQUENT OFFERING PERIOD OF
                  TENDER OFFER FOR COMSHARE TO AUGUST 13, 2003

         - Approximately 89.8% of Comshare's Shares Tendered to Date -

MARKHAM, ONTARIO AND ANN ARBOR, MICHIGAN - August 12, 2003 - Geac Computer
Corporation Limited (TSX: GAC), a global enterprise software company for
Business Performance Management, and Comshare, Incorporated (Nasdaq: CSRE), a
leading provider of software that helps companies implement and execute
strategy, today announced that the expiration date of the subsequent offering
period for Geac's tender offer to purchase all the outstanding common shares of
Comshare, originally set for 5:00 p.m. EDT on August 11, 2003, has been extended
by two days, to 5:00 p.m. EDT on Wednesday, August 13, 2003, which will permit
the acceptance by Geac of late tenders. Based upon a preliminary tally by
Equiserve Trust Company, N.A., the depositary for the offer, 9,741,905 shares,
or approximately 89.8% of Comshare's outstanding shares, had been validly
tendered by the close of business on August 11, 2003, the originally scheduled
expiration date for the subsequent offering period. Common shares of Comshare
validly tendered during the subsequent offering period will be accepted
immediately and paid for promptly as they are accepted. Holders who validly
tender during the subsequent offering period will receive the same offer price
of US$4.60 net per share, in cash, paid to holders who tendered during the
original offering period. Pursuant to Rule 14d-7(a)(2) under the Securities
Exchange Act of 1934, no withdrawal rights will apply during the subsequent
offering period.

Questions and requests for assistance concerning the offer may be directed to
Georgeson Shareholder Securities Corporation, the dealer manager for the offer,
at (800) 445-1790, or Georgeson Shareholder Communications Inc., the information
agent for the offer, at (800) 286-9178.

ABOUT GEAC

Geac (TSX: GAC), is a global enterprise software company for Business
Performance Management, providing customers worldwide with the core financial
and operational solutions and services to improve their business performance in
real time. Further information is available at HTTP://WWW.GEAC.COM or through
e-mail at INFO@GEAC.COM.

ABOUT COMSHARE

Comshare, Incorporated (NASDAQ:CSRE) is a leading provider of software that
helps companies implement and execute strategy. Comshare's corporate performance
management application encompasses planning, budgeting, forecasting, financial
consolidation, management reporting and analysis. For more information on
Comshare, please call 1-800-922-7979, send email to INFO@COMSHARE.COM or visit
Comshare's website at WWW.COMSHARE.COM.

SAFE HARBOR STATEMENT

Geac has filed with the Securities and Exchange Commission a tender offer
statement on Schedule TO, and Comshare has filed with the Commission a
solicitation/recommendation statement on Schedule 14D-9,

with respect to the tender offer. Comshare stockholders are advised to read
Geac's tender offer statement and Comshare's solicitation/recommendation
statement, as amended, because they contain important information about Geac,
Comshare, the tender offer and the merger. Comshare stockholders may obtain free
copies of these statements from the Securities and Exchange Commission's website
at www.sec.gov, or by contacting Geac Investor Relations at 905-475-0525 x3325
or INVESTOR@GEAC.COM or Comshare Investor Relations at 734-994-4800 or
BJARZYNSKI@COMSHARE.COM.

This press release may contain forward-looking statements based on current
expectations. Important factors that could cause a material difference between
these forward-looking statements and actual events include those set forth under
the heading "Risks and Uncertainties" in Geac's Management Discussion and
Analysis for the fiscal year ended April 30, 2003 contained in its Report of
Foreign Issuer on Form 6-K, filed with the United States Securities and Exchange
Commission on July 2, 2003, copies of which are available through the website
maintained by the SEC at www.sec.gov, and in Geac's Management Discussion and
Analysis for the fiscal year ended April 30, 2003 filed with the Canadian
Securities Administrators on June 25, 2003 and available through the website
maintained by the Canadian Depository for Securities Limited at WWW.SEDAR.COM.

FOR FURTHER INFORMATION

Melody Firth
Geac
905.475.0525
melody.firth@geac.com