(BLAKE, CASSELS & GRAYDON LLP LOGO)

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                                                    199 Bay Street
                                                    Toronto, Ontario, Canada
                                                    M5L 1A9

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                                                    www.blakes.com

October 10, 2003




Geac Computer Corporation Limited
11 Allstate Parkway
Suite 300
Markham, Ontario
L3R 9T8


Dear Sirs, Mesdames:

                  RE:     REGISTRATION STATEMENT ON FORM S-8 RELATING TO CERTAIN
                          OPTION PLANS

                  Reference is made to the above-captioned Registration
Statement on Form S-8 (the "Registration Statement") filed by Geac Computer
Corporation Limited ("Geac") under the Securities Act of 1933 relating to the
registration of an aggregate of 4,493,570 common shares of Geac (the "Shares")
issuable on the exercise of (i) options granted pursuant to the Geac Computer
Corporation Limited Stock Option Plan VI and (ii) purchase rights pursuant to
the Geac 2003 Employee Stock Purchase Plan (collectively, the "Plans") filed as
exhibits to the Registration Statement.

                  We have examined and have relied as to factual matters solely
upon copies of the Plans, and certified copies of the currently effective
articles and by-laws of Geac, certified resolutions of the Board of Directors of
Geac and originals or certified copies of such other documents, certificates,
instruments and proceedings as we have deemed necessary or advisable as the
basis for the opinions expressed below without independent verification of the
accuracy thereof.

                  For the purposes of this opinion, we have assumed the
genuineness of all signatures, the legal capacity of all individuals, the
authenticity of all documents submitted to us as originals and the conformity to
the originals of all documents submitted to us as certified, conformed or
photostatic copies or electronically transmitted copies or facsimilies thereof.

                  The opinions hereinafter expressed are limited to the laws of
Ontario and the laws of Canada applicable therein. We assume no obligation to
revise or supplement this opinion


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(BLAKE, CASSELS & GRAYDON LLP LOGO)


                                                                          Page 2




should applicable laws of any jurisdiction be changed subsequent to the date
hereof by legislative action, judicial decision or otherwise.

                  Based on the foregoing, we are of the opinion that the Shares
have been duly authorized and, when issued and paid for in accordance with the
terms of the applicable Plan providing for such issuance and payment, will be
validly issued as fully paid and non-assessable.

                                    * * * * *

                  We are furnishing this opinion in connection with the filing
of the Registration Statement with the Securities and Exchange Commission and
this opinion is not to be used, circulated, quoted or otherwise referred to for
any other purpose without our express written consent.

                  We hereby consent to the filing of this opinion as an exhibit
to the Registration Statement and to the reference to our firm name set forth
under the caption "Interests of Named Experts and Counsel" in the Registration
Statement.

                                      Yours truly,



                                      "Blake, Cassels & Graydon LLP"