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August 5, 2005

                                IMPORTANT NOTICE

Dear Shareholder:

Thank you for the timely return of your proxy card relating to the June 22, 2005
shareholder meeting of the Van Kampen California Municipal Trust. The
shareholder meeting was adjourned to July 22, 2005 and has been adjourned again
to August 12, 2005 to allow for the solicitation of additional votes.

Our records reflect your preference to abstain on proposal #1 which relates to
the Agreement and Plan of Reorganization between Van Kampen California Municipal
Trust ("Target Fund") and Van Kampen California Value Municipal Income Trust
("Acquiring Fund"). This letter is intended to provide you with information
regarding the proposed transaction. THIS ISSUE IS OF UTMOST IMPORTANCE AND WE
ARE WRITING TO ASK THAT YOU TAKE A FEW MOMENTS TO REVIEW THE INFORMATION
CONTAINED WITHIN THIS LETTER AND RECONSIDER YOUR PREVIOUS VOTE.

The proposed reorganization seeks to combine similar Funds to achieve certain
economies of scale and other operational efficiencies. After the reorganization,
it is anticipated the common shareholders of each Fund will experience a reduced
annual operating expense ratio, as certain fixed administrative costs will be
spread across the combined fund's larger asset base. It is not anticipated that
the reorganization will directly benefit preferred shareholders of the Funds;
however, the reorganization will not adversely affect preferred shareholders,
and none of the expenses of the reorganization will be borne by preferred
shareholders.

Unless the requisite vote of both preferred shareholders and common
shareholders, each voting separately as a class, is achieved, the reorganization
will not be approved.

Upon evaluation of all relevant information, the Board of Trustees of Van Kampen
California Municipal Trust voted unanimously to approve the reorganization. The
Board of Trustees recommends that you vote "FOR" the proposed reorganization.

Your vote is important and your participation in the affairs of your Fund does
make a difference. If you decide to change your vote, you can do so by mail,
Internet or touch-tone phone. Please refer to the enclosed proxy card for
instructions to cast your vote. Receipt of a proxy vote with a later date will
completely revoke your previous ballot.

If you have any questions or would like an additional proxy statement, please
contact Van Kampen's Client Relations Department at 1-800-341-2929.

We appreciate your time and careful consideration.

Sincerely,


VAN KAMPEN CALIFORNIA MUNICIPAL 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.