SCHEDULE 14A
                                 (Rule 14a-101)

                     INFORMATION REQUIRED IN PROXY STATEMENT
                            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 Statment  (_]  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-12

                          IXIS Advisor Funds Trust III
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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)

Payment of filing fee (check the appropriate box):
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[_] Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
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              pursuant to Exchange Act Rule 0-11 (Set forth the amount on which
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[_]   Fee paid previously with preliminary materials.
[_]   Check box if any part of the fee is offset as provided by Exchange Act
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      paid previously. Identify the previous filing by registration statement
      number, or the Form or Schedule and the date of its filing.
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June 2, 2005


Dear Shareholder:

In April you received proxy voting materials regarding a proposal to change the
Declarations of Trust for the IXIS Advisor Funds and Loomis Sayles Funds. The
Special Meeting of Shareholders was held on June 2, 2005 and was adjourned to
allow for the solicitation of additional necessary votes. The meeting has been
rescheduled for June 22, 2005.

To date, we have not received your vote. Please take a few minutes to review the
information provided in this letter and vote your shares. We cannot emphasize
enough the importance of your vote, regardless of how many shares you own.
Voting promptly also is important as the rescheduled meeting date is June 22. If
we do not receive enough votes by that date, we may have to resolicit
shareholders. Please help your fund avoid the expense of additional solicitation
by voting today.

The Agreement and Declarations of Trust for each Trust governs the basic
operations of the Trusts. Shareholder approval is required for certain changes.
The changes described in the proxy statement you received in April are intended
to modernize the Declarations of Trust to accommodate changes in law or practice
since the Declarations of Trust were last approved by shareholders, as well as
to make the Declarations of Trust uniform across the Trusts. We anticipate that
the overall effect of these changes will reduce costs and expenses in the
administration of the Funds and provide more flexibility for the operations of
the Funds, within limits of applicable law.

Vote by toll-free telephone, Internet or mail
Voting by toll-free telephone or via the Internet is the quickest way to
register your vote before the meeting. Of course, you also may vote by returning
the enclosed proxy card. A self-addressed, postage-paid envelope has been
enclosed for your convenience. Please see the enclosed proxy card for more
information and voting instructions. If you do vote via the Internet or by
telephone, you do not need to mail your proxy card. If you want to change your
vote, you may do so using any of these methods. A proxy solicitation firm, Alamo
Direct, may call to remind you to return your proxy.

Thank you for your cooperation in voting on this important proposal. If you have
questions, please call your financial representative.
Sincerely,


John T. Hailer                                  Robert Blanding
President, IXIS Advisor Funds                   President, Loomis Sayles Funds I
and Loomis Sayles Funds II


IXIS Asset Management Distributors, L.P.o 399 Boylston Street o Boston, MA 02116
                            www.ixisadvisorfunds.com




June 2, 2005


Dear Shareholder:

In April you received proxy voting materials regarding a proposal to change the
Declarations of Trust for the IXIS Advisor Funds and Loomis Sayles Funds. The
Special Meeting of Shareholders was held on June 2, 2005 and was adjourned to
allow for the solicitation of additional necessary votes. The meeting has been
rescheduled for June 22, 2005.

To date, we have not received your vote. Please take a few minutes to review the
information provided in this letter and vote your shares. We cannot emphasize
enough the importance of your vote, regardless of how many shares you own.
Voting promptly also is important as the rescheduled meeting date is June 22. If
we do not receive enough votes by that date, we may have to resolicit
shareholders. Please help your fund avoid the expense of additional solicitation
by voting today.

The Agreement and Declarations of Trust for each Trust governs the basic
operations of the Trusts. Shareholder approval is required for certain changes.
The changes described in the proxy statement you received in April are intended
to modernize the Declarations of Trust to accommodate changes in law or practice
since the Declarations of Trust were last approved by shareholders, as well as
to make the Declarations of Trust uniform across the Trusts. We anticipate that
the overall effect of these changes will reduce costs and expenses in the
administration of the Funds and provide more flexibility for the operations of
the Funds, within limits of applicable law.

Vote by toll-free telephone, Internet or mail
Voting by toll-free telephone or via the Internet is the quickest way to
register your vote before the meeting. Of course, you also may vote by returning
the enclosed proxy card. A self-addressed, postage-paid envelope has been
enclosed for your convenience. Please see the enclosed proxy card for more
information and voting instructions. If you do vote via the Internet or by
telephone, you do not need to mail your proxy card. If you want to change your
vote, you may do so using any of these methods. A proxy solicitation firm, Alamo
Direct, may call to remind you to return your proxy.

Thank you for your cooperation in voting on this important proposal. If you have
questions, please call your financial representative. Or, if your questions
relate specifically to the proxy, please call our service center representatives
toll-free at 800-225-5478.

Sincerely,


John T. Hailer                                  Robert Blanding
President, IXIS Advisor Funds                   President, Loomis Sayles Funds I
and Loomis Sayles Funds II


IXIS Asset Management Distributors, L.P.o 399 Boylston Street o Boston, MA 02116
                            www.ixisadvisorfunds.com



Excerpts of www.ixisadvisorfunds.com website:

On homepage:

Online proxy voting is now available for all shareholders. [Links to page below]
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IXIS Advisor Funds:Online Proxy Voting


        Online Proxy Voting

        IXIS Asset Management Distributors, L.P. has announced
        an important proposal regarding many of our funds, which
        requires a shareholder vote.

        The Special Meeting of Shareholders was held on June 2, 2005
        and was adjourned for certain funds to allow for the
        solicitation of additional necessary votes in connection with
        the proposal to change the Declarations of Trust. The meeting
        has been rescheduled for June 22, 2005. Funds eligible to vote
        for the proposal to change the Declarations of Trust are
        listed below.

        [Link] Proxy letter to shareholders*
        [Link] Official proxy statement*
        [Link to vote.proxy-direct.com] Enter our Electronic Proxy Voting Center


        Remember - your vote counts

                  Important note:
                  Please help your fund avoid the expense of additional
                  solicitation by voting today. If you own shares in more
                  than one account, you may have received a separate card
                  for each account. These are not duplicate cards; it is
                  important to vote each account represented by the proxy
                  cards received.

                  Your vote is extremely important, regardless of the number of
                  shares you own. Voting promptly is also essential. If we do
                  not receive enough votes, we will have to resolicit
                  shareholders. You may receive a reminder call to return your
                  proxy.

                  If you vote electronically, you do not need to mail your proxy
                  card.

                  However, if you want to change your vote you may do so using
                  the proxy card, telephone or Internet.

                  Thank you for your cooperation in voting on this important
                  proposal. If you have any questions regarding the proxy
                  statement, please call your financial advisor, or call IXIS
                  Advisor Funds at 800-225-5478.

                  * To download or print PDF files, you must have Adobe Acrobat
                  Reader software on your computer. You may obtain this software
                  free of charge at Adobe's Web site.