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                                IMPORTANT NOTICE


October 24, 2005


The joint special meeting of shareholders (the "Meeting") of Van Kampen
Advantage Municipal Income Trust and Van Kampen Municipal Opportunity Trust
(each, a "Fund"), was held on September 23, 2005 and was adjourned to October
21, 2005. The joint special meeting has been further adjourned to November 22,
2005 to allow additional time to solicit additional votes in connection with the
proposals as outlined in the Notice of Joint Special Meeting of Shareholders
previously mailed to you. The adjourned meeting will be held at 10:30 a.m.
Central Time on November 22, 2005 at the offices of Van Kampen Investments Inc.,
1 Parkview Plaza, Oakbrook Terrace, Illinois.

YOUR VOTE IS IMPORTANT AND YOUR PARTICIPATION IN THE AFFAIRS OF YOUR FUND DOES
MAKE A DIFFERENCE.

The purpose of the Meeting is to seek shareholder approval for the
reorganization of Van Kampen Advantage Municipal Income Trust into Van Kampen
Municipal Opportunity Trust (the "Reorganization") and the issuance of
additional common shares of Van Kampen Municipal Opportunity Trust. The proposed
Reorganization seeks to combine similar funds to achieve certain economies of
scale and other operational efficiencies.

After careful consideration, the Board of Trustees of each Fund has determined
that the Reorganization and the issuance of additional common shares will
benefit the common shareholders of each Fund and recommends that you cast your
vote "FOR" the proposed Reorganization and the issuance of additional common
shares, as applicable.

Please join many of your fellow shareholders and cast your vote. To cast your
vote, simply complete the enclosed proxy card and return it in the postage paid
envelope provided. As a matter of convenience, you may cast your vote via the
Internet or by telephone. Instructions for casting your vote via the Internet or
telephone are printed on the enclosed proxy ballot. Additionally, the required
control number for either of these methods is printed on the proxy card. If you
choose to cast your vote via the Internet or telephone, there is no need to mail
the card.

If you have any questions, please do not hesitate to contact the Van Kampen
Client Relations Department at 1-800-341-2929.

We appreciate your careful and prompt consideration of this matter.


VAN KAMPEN ADVANTAGE MUNICIPAL INCOME TRUST
VAN KAMPEN MUNICIPAL OPPORTUNITY TRUST



The foregoing does not constitute an offer of any securities for sale. The joint
proxy statement/prospectus relating to the proposed reorganization contains
important information and shareholders are urged to read it. Free copies of the
joint proxy statement/prospectus are available by calling Van Kampen's Client
Relations Department at (800)341-2929 or on the SEC's web site at www.sec.gov