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[AIM INVESTMENTS LOGO APPEARS HERE]
                                                                          FOUR EASY WAYS TO VOTE YOUR PROXY

                                                      INTERNET:    Go to www.xxxxxxxxxxxxxx.xxx and follow the online directions.

                                                      TELEPHONE:   Call 1-800-XXX-XXXX and follow the simple instructions.

                                                      MAIL:        Vote, sign, date and return your proxy by mail.

                                                      IN PERSON:   Vote at the Special Meeting of Shareholders.

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                999 999 999 999 99

AIM ADVANTAGE HEALTH SCIENCES FUND (THE "FUND")                               PROXY SOLICITED BY THE BOARD OF TRUSTEES (THE "BOARD")
AN INVESTMENT PORTFOLIO OF AIM COUNSELOR SERIES TRUST                                PROXY FOR SPECIAL MEETING OF SHAREHOLDERS TO BE
                                                                                                                 HELD MARCH 15, 2007


The undersigned hereby appoints Philip A. Taylor, John M. Zerr and Sidney M. Dilgren, and any one of them separately, proxies with
full power of substitution in each, and hereby authorizes them to represent and to vote, as designated on the reverse of this proxy
card, at the Special Meeting of Shareholders on March 15, 2007, at 3:00 p.m., Central Time, and at any adjournment or postponement
thereof, all of the shares of the FUND which the undersigned would be entitled to vote if personally present. IF THIS PROXY IS
SIGNED AND RETURNED WITH NO CHOICE INDICATED, THE SHARES WILL BE VOTED "FOR" THE APPROVAL OF THE PROPOSAL.

                                                     NOTE:    IF YOU VOTE BY TELEPHONE OR ON THE INTERNET, PLEASE DO NOT RETURN YOUR
                                                              PROXY CARD.

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                                                              PROXY MUST BE SIGNED AND DATED BELOW.


                                                     Dated ____________________ 2007



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                                                     Signature(s) (if held jointly)                                (SIGN IN THE BOX)

                                                     NOTE: PLEASE SIGN EXACTLY AS YOUR NAME APPEARS ON THIS PROXY CARD. All joint
                                                     owners should sign. When signing as executor, administrator, attorney, trustee
                                                     or guardian or as custodian for a minor, please give full title as such. If a
                                                     corporation, limited liability company, or partnership, please sign in full
                                                     entity name and indicate the signer's position with the entity.


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                                   [ARROW    PLEASE FILL IN BOX AS SHOWN USING BLACK OR BLUE INK OR NUMBER 2 PENCIL. [X]   [ARROW
                                   GRAPHIC]  PLEASE DO NOT USE FINE POINT PENS.                                            GRAPHIC]

THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD. THE BOARD RECOMMENDS VOTING "FOR" THE PROPOSAL.

                                                                                  FOR                AGAINST               ABSTAIN

                                                                                  [ ]                  [ ]                   [ ]

1  Approve an Agreement and Plan of Reorganization (the "Agreement") under which
   all of the assets of AIM Advantage Health Sciences Fund (the "Fund"), a
   portfolio of AIM Counselor Series Trust ("Trust"), will be transferred to AIM
   Global Health Care Fund ("Buying Fund"), a portfolio of AIM Investment Funds
   ("Buyer"), and Buyer will issue shares of each class of Buying Fund to
   shareholders of the corresponding class of shares of the Fund.



PROXIES ARE AUTHORIZED TO VOTE, IN THEIR DISCRETION, UPON SUCH OTHER BUSINESS AS MAY PROPERLY COME BEFORE THE MEETING OR ANY
ADJOURNMENT OR POSTPONEMENT THEREOF.



                         PLEASE VOTE, SIGN AND DATE THIS PROXY CARD AND RETURN IT IN THE ENCLOSED ENVELOPE.



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