EXHIBIT 99(b) EVERY SHAREHOLDER'S VOTE IS IMPORTANT YOUR PROXY VOTE IS IMPORTANT! AND NOW YOU CAN VOTE YOUR PROXY ON THE PHONE, OR THE INTERNET. IT SAVES MONEY! TELEPHONE, FACSIMILE AND INTERNET VOTING SAVES POSTAGE COSTS. SAVINGS WHICH CAN HELP MINIMIZE EXPENSES. IT SAVES TIME! TELEPHONE AND INTERNET VOTING IS INSTANTANEOUS - 24 HOURS A DAY. IT'S EASY! JUST FOLLOW THESE SIMPLE STEPS: 1. READ YOUR PROXY STATEMENT AND HAVE IT AT HAND. 2. CALL TOLL-FREE 1-866-241-6192, OR GO TO WEBSITE: HTTPS://VOTE.PROXY-DIRECT.COM 3. FOLLOW THE RECORDED OR ON-SCREEN DIRECTIONS. 4. DO NOT MAIL YOUR PROXY CARD WHEN YOU VOTE BY PHONE, OR INTERNET. Please detach at perforation before mailing. PROXY VAN KAMPEN ADVANTAGE MUNICIPAL INCOME TRUST PROXY AND VAN KAMPEN MUNICIPAL OPPORTUNITY TRUST NOTICE OF JOINT SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON SEPTEMBER 23, 2005 Notice is hereby given that a joint special meeting of shareholders (the "Special Meeting") of Van Kampen Advantage Municipal Income Trust (the "Target Fund") and Van Kampen Municipal Opportunity Trust (the "Acquiring Fund") will be held at the offices of Van Kampen Investments Inc., 1 Parkview Plaza, Oakbrook Terrace, Illinois 60181-5555 on September 23, 2005 at 10:00 a.m. THIS PROXY IS SOLICITED ON BEHALF OF EACH FUND'S BOARD OF TRUSTEES. THE BOARD OF TRUSTEES OF EACH FUND REQUESTS THAT YOU VOTE YOUR SHARES BY INDICATING YOUR VOTING INSTRUCTIONS ON THE ENCLOSED PROXY CARD, DATING AND SIGNING SUCH PROXY CARD AND RETURNING IT IN THE ENVELOPE PROVIDED, WHICH IS ADDRESSED FOR YOUR CONVENIENCE AND NEEDS NO POSTAGE IF MAILED IN THE UNITED STATES, OR BY RECORDING YOUR VOTING INSTRUCTIONS BY TELEPHONE OR VIA THE INTERNET. VOTE VIA THE TELEPHONE: 1-866-241-6192 VOTE VIA THE INTERNET: HTTPS://VOTE.PROXY-DIRECT.COM 999 9999 9999 999 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, please sign in full corporate name and indicate the signer's office. If a partner, sign in the partnership name. -------------------------------------- Signature -------------------------------------- Signature (if held jointly) -------------------------------------- Date XXX XXXX EVERY SHAREHOLDER'S VOTE IS IMPORTANT PLEASE SIGN, DATE AND RETURN YOUR PROXY TODAY Please detach at perforation before mailing. THE BOARD OF TRUSTEES RECOMMENDS THAT YOU VOTE FOR THE PROPOSALS. PLEASE MARK VOTES AS IN THIS EXAMPLE: [X] FOR AGAINST ABSTAIN 1. Not applicable to the Acquiring Fund. [ ] [ ] [ ] 2. To approve the issuance of additional common shares of the Acquiring Fund in connection with the Agreement and Plan of Reorganization between the Target Fund and the Acquiring Fund; and 3. To transact such other business as may properly be presented at the Special Meeting or any adjournment thereof. YOUR VOTE IS IMPORTANT. PLEASE VOTE PROMPTLY BY SIGNING AND RETURNING THE ENCLOSED PROXY CARD OR BY RECORDING YOUR VOTING INSTRUCTIONS BY TELEPHONE OR VIA THE INTERNET NO MATTER HOW MANY SHARES YOU OWN. XXXXX XXXXXX