UNITED STATES
                          SECURITIES AND EXCHANGE COMMISSION
                                 Washington, DC 20549


                              SCHEDULE 14A INFORMATION

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

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 material pursuant to Rule 14a-11(c) or Rule 14a-12

                              Columbia Funds Series Trust
                    (Name of Registrant as Specified In Its Charter)

 Payment of filing fee (Check the appropriate box):

|X| No fee required.

|_| Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.
 (1) Title of each class of securities to which transaction applies:
 (2) Aggregate number of securities to which transaction applies:
 (3) Per unit price or other underlying value of transaction computed pursuant
     to Exchange Act Rule 0-11:
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 (5) Total fee paid:

|_|  Fee paid previously with preliminary materials

|_| Check box if any part of the fee is offset as provided by Exchange Act Rule
0-11(a)(2) and identify the filing for which the offsetting fee was paid
previously. Identify the previous filing by registration statement number, or
the form or schedule and the date of its filing.

     (1) Amount Previously Paid:
     (2) Form, Schedule or Registration Statement No.:
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IMPORTANT NOTICE


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                               Columbia Funds Series Trust
                            Columbia Marsico 21st Century Fund



                            SPECIAL MEETING OF SHAREHOLDERS
                                   HAS BEEN ADJOURNED

     We recently distributed proxy materials relating to a special meeting of
     shareholders of Columbia Marsico 21st Century Fund, a series of Columbia
     Funds Series Trust. The special meeting for the Fund, originally scheduled
     for October 22, 2007, at 10:00 a.m. Eastern time, has been adjourned in
     order to give shareholders additional time to vote their shares. The
     reconvened special meeting of shareholders of the Fund will be held on
     December 10, 2007 at 10:00 a.m., Eastern time, at One Financial Center,
     Boston, Massachusetts 02111. The record date for the special meeting will
     remain August 20, 2007.

     Your vote for this important meeting has not yet been received. If
     sufficient votes have not been received for the meeting by December 10th,
     further meeting adjournments may be proposed to allow shareholders
     additional time to vote their shares.

     We encourage you to utilize one of the following options today to record
     your vote. Voting by phone or internet is the best way to ensure that your
     vote is recorded in time for the meeting.

1.       By Phone: You may cast your vote by telephone by calling the toll-free
         number and entering the Control Number printed on the Proxy Ballot.

2.       By Internet: You may cast your vote on line by logging on to the
         Internet address printed on the enclosed Proxy Ballot, entering the
         Control Number printed on the Proxy Ballot and following the
         instructions on the Web site.

3.       By Mail: If you prefer to vote by mail, please complete the Proxy
         Ballot and return it in the enclosed postage-paid envelope.

                  Remember, your vote counts. Please vote today.

     If you have any questions  regarding the proposal,  please call
     Computershare Fund Services, your Fund's proxy agent, at 866.432.4864.
     Representatives are available Monday through Friday between the hours of
     9:00 a.m. and 11:00 p.m. and Saturday from 12:00 p.m. to 6:00 p.m.,
     Eastern time.

     Your vote will help reduce the need for additional solicitation efforts or
     additional costly meeting adjournments. Certain shareholders of the Fund
     may receive a telephone call from a representative of Computershare Fund
     Services if their votes have not yet been received.

     Thank you for your prompt attention to this matter.