SCHEDULE 14A INFORMATION
                Proxy Statement Pursuant to Section 14(a) of the
                         Securities Exchange Act of 1934

                               (Amendment No. ___)

Filed by the Registrant [X]
Filed by a Party other than the Registrant   [_]

Check the appropriate box:

[_]  Preliminary Proxy Statement
[_]  Confidential, for Use of the Commission Only (as permitted by Rule
     14a-6(e)(2))
[_]  Definitive Proxy Statement
[X]  Definitive Additional Materials
[_]  Soliciting Materials Pursuant to Section 240.14a-12


                  ALLIANCE NATIONAL MUNICIPAL INCOME FUND, INC.
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                (Name of Registrant as Specified In Its Charter)



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                   (Name of Person(s) Filing Proxy Statement,
                          if other than the Registrant)

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(LOGO)                                                IMPORTANT NOTICE REGARDING
                                                            YOUR INVESTMENT


                   ACM MUNICIPAL SECURITIES INCOME FUND, INC.

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                           1345 Avenue of the Americas
                               New York, NY 10105

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                                                               February 26, 2007

Dear Stockholder:

The Special  Meeting of Stockholders  of ACM Municipal  Securities  Income Fund,
Inc. (the "Fund") was scheduled on February 22, 2007 for stockholders to vote on
the proposed  acquisition of the assets and assumption of the liabilities of the
Fund by Alliance  National  Municipal Income Fund, Inc.  ("National  Municipal")
(the "Acquisition") and the dissolution of the Fund.

The Special  Meeting was convened on February 22, 2007 for common and  preferred
holders voting as a single class,  but was adjourned until  Thursday,  March 15,
2007 for the preferred  holders voting as a separate class.  The Special Meeting
will be reconvened at the offices of the Fund, 1345 Avenue of the Americas,  New
York, New York at 4:00 p.m.  Eastern Time with respect to the preferred  holders
voting as a separate class.

At the Special  Meeting  Stockholders  are being asked to consider  the proposed
Acquisition.  If the  Acquisition is approved,  each holder of the Fund's common
stock will receive shares of National Municipal common stock having an aggregate
net asset value ("NAV") equal to the aggregate NAV of the  stockholder's  shares
in the Fund and each holder of the Fund's preferred stock will receive shares of
a similar class of National Municipal  preferred stock having the same aggregate
liquidation preference and value.

OUR RECORDS  INDICATE THAT YOU HAVE NOT YET VOTED ON THIS  PROPOSAL.  IF YOU ARE
NOT  PLANNING  TO ATTEND THE SPECIAL  MEETING,  PLEASE TAKE A MOMENT NOW TO CAST
YOUR VOTE SO THAT YOUR SHARES MAY BE REPRESENTED AT THE SPECIAL MEETING.

Another copy of your proxy ballot is enclosed for your convenience. Should you
have any questions regarding the Proposal or to vote your shares, please call
1-800-331-5817.

To vote your  shares,  the  following  voting  options have been set up for your
convenience.

     1.   Vote by Phone.  You may cast your vote by phone by  calling  the phone
          number located on the enclosed proxy ballot.

     2.   Vote Through the  Internet.  You may cast your vote using the internet
          by logging on to the internet  address  located on the enclosed  proxy
          ballot and following the instructions on the website.

     3.   Vote by Mail.  You may cast your vote by  signing,  dating and mailing
          the  enclosed  proxy  ballot  in  the  postage  paid  return  envelope
          provided.

Again,  please do not hesitate to call toll-free  1-800-331-5817 if you have any
questions regarding this Special Meeting.

No matter how many shares you own,  your vote is  important.  Thank you for your
assistance with this important matter.

Sincerely,

Marc. O. Mayer
President





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