IXIS CASH MANAGEMENT TRUST - MONEY MARKET SERIES

Supplement dated May 2, 2005 to IXIS Cash Management Trust - Money Market Series
Statement  of  Additional  Information,  dated  September  1,  2004,  as  may be
supplemented from time to time


EFFECTIVE  NOVEMBER 1, 2004,  THE NAME OF THE  DISTRIBUTOR  FOR THE FUND CHANGED
FROM CDC IXIS ASSET  MANAGEMENT  DISTRIBUTORS,  L.P.  TO IXIS  ASSET  MANAGEMENT
DISTRIBUTORS, L.P.

EFFECTIVE NOVEMBER 1, 2004, THE NAME OF THE ADVISER TO THE FUND CHANGED FROM CDC
IXIS ASSET MANAGEMENT ADVISERS, L.P. TO IXIS ASSET MANAGEMENT ADVISORS, L.P.

EFFECTIVE  JANUARY 1, 2005,  THE NAME OF THE TRANSFER AGENT FOR THE FUND CHANGED
FROM CDC IXIS ASSET MANAGEMENT  SERVICES COMPANY,  INC. TO IXIS ASSET MANAGEMENT
SERVICES COMPANY.

EFFECTIVE MAY 1, 2005, THE FUND CHANGED ITS NAME FROM CDC NVEST CASH  MANAGEMENT
TRUST - MONEY MARKET SERIES TO IXIS CASH MANAGEMENT TRUST - MONEY MARKET SERIES,
AND THE TRUST  CHANGED  ITS NAME FROM CDC NVEST  CASH  MANAGEMENT  TRUST TO IXIS
ADVISORS CASH MANAGEMENT TRUST. ALSO EFFECTIVE MAY 1, 2005, THE NAME OF THE FUND
FAMILY CHANGED FROM CDC NVEST FUNDS TO IXIS ADVISOR FUNDS.  THUS, ALL REFERENCES
TO CDC NVEST FUNDS AND  WWW.CDCNVESTFUNDS.COM  ARE  REPLACED  WITH IXIS  ADVISOR
FUNDS AND WWW.IXISADVISORFUNDS.COM, RESPECTIVELY.

EFFECTIVE MAY 1, 2005, THE FOLLOWING TEXT IS ADDED TO THE SECTION "MANAGEMENT OF
THE TRUSTS":

Two  individuals  have been  nominated  for  election  as  Trustees,  subject to
shareholder  approval.  Each of the nominees listed below is expected to qualify
as an "Independent  Trustee." A special meeting of shareholders of each Trust is
scheduled  for June 2,  2005.  Should  either  Mr.  Baker or Ms.  Walker  not be
elected, this Statement will be supplemented.



                                                                                                          

- ------------------------------- ------------------------------- -------------------------------------- ----------------------------

             NAME                       POSITION HELD                  PRINCIPAL OCCUPATION(S)
         AND ADDRESS                     WITH TRUSTS                     DURING PAST 5 YEARS              OTHER DIRECTORSHIPS HELD
         -----------                     -----------                     -------------------              ------------------------
- ------------------------------- ------------------------------- -------------------------------------- ----------------------------
- ------------------------------- ------------------------------- -------------------------------------- ----------------------------
CHARLES D. BAKER                Nominee for Trustee             President and Chief Executive          None
93 Worcester Street                                             Officer, Harvard Pilgrim Health Care
Wellesley, MA 02481                                             (health plan)
- ------------------------------- ------------------------------- -------------------------------------- ----------------------------
- ------------------------------- ------------------------------- -------------------------------------- ----------------------------
CYNTHIA L. WALKER               Nominee for Trustee             Dean for Finance and CFO (formerly,    None
                                                                Associate Dean for Finance & CFO),
                                                                Harvard Medical School
- ------------------------------- ------------------------------- -------------------------------------- ----------------------------



     The  Committee  on which Mr.  Baker or Ms.  Walker  will  serve if they are
elected as Trustees of the Trusts has not been determined.

EFFECTIVE MAY 1, 2005, THE SUB-SECTION "AUTOMATIC INVESTMENT PLANS (CLASSES A, B
AND C SHARES)" OF THE SECTION "SHAREHOLDER SERVICES" IS REPLACED IN ITS ENTIRETY
WITH THE FOLLOWING:

AUTOMATIC INVESTMENT PLANS (CLASSES A, B AND C SHARES)

     Subject to the Fund's  investor  eligibility  requirements,  investors  may
automatically  invest in  additional  shares  of the Fund on a monthly  basis by
authorizing the  Distributor to draw checks on an investor's  bank account.  The
checks are drawn under the Investment  Builder  Program,  a program  designed to
facilitate  such  periodic  payments  and are  forwarded  to IXIS  Services  for
investment  in the Fund.  A plan may be opened  with an  initial  investment  of
$1,000  or more and  thereafter  regular  monthly  checks of $50 or more will be
drawn on the investor's  account.  (Shareholders with accounts  participating in
the IXIS Advisor  Funds'  Investment  Builder  program  prior to May 1, 2005 may
continue to make subsequent  purchases of $25 into those  accounts.) The reduced
minimum initial investment pursuant to an automatic  investment plan is referred
to in the Prospectus.  An Investment  Builder  application  must be completed to
open an automatic investment plan and may be obtained by calling the Distributor
at  800-225-5478  or your  investment  dealer  or by  visiting  our  Website  at
www.ixisadvisorfunds.com.


     This  program  is  voluntary  and  may be  terminated  at any  time by IXIS
Services  upon notice to existing  plan  participants.  The  Investment  Builder
Program plan may be  discontinued  at any time by the investor by written notice
to IXIS  Services,  which must be received at least five  business days prior to
any payment date. The plan may be  discontinued by State Street Bank at any time
without prior notice if any check is not paid upon  presentation;  or by written
notice to the shareholder at least thirty days prior to any payment date.  State
Street Bank is under no obligation to notify  shareholders  as to the nonpayment
of any check.

EFFECTIVE  MAY 1,  2005,  THE  SUB-SECTION  "RETIREMENT  PLANS AND  OTHER  PLANS
OFFERING TAX BENEFITS" OF THE SECTION "SHAREHOLDER  SERVICES" IS REPLACED IN ITS
ENTIRETY WITH THE FOLLOWING:

RETIREMENT PLANS AND OTHER PLANS OFFERING TAX BENEFITS

     The federal tax laws provide for a variety of retirement plans offering tax
benefits.  These  plans may be funded  with  shares of the Fund or with  certain
other  investments.  The plans include H.R. 10 (Keogh)  plans for  self-employed
individuals and partnerships,  individual retirement accounts (IRAs),  corporate
pension trust and profit sharing plans,  including  401(k) plans, and retirement
plans for public  school  systems and certain  tax exempt  organizations,  i.e.,
403(b) plans.

The reduced minimum initial  investment  available to retirement plans and other
plans offering tax benefits is referred to in the  Prospectus.  For these plans,
initial  investments  in a Fund must be at least $1,000 for IRAs and Keogh plans
using the IXIS Advisor  Funds'  prototype,  at least $500 for IRAs and Coverdell
Education  Savings  Accounts and at least $100 for any  subsequent  investments.
Income dividends and capital gain  distributions  must be reinvested (unless the
investor is over age 59 1/2 or disabled). These types of accounts may be subject
to fees.  Plan  documents  and  further  information  can be  obtained  from the
Distributor.

Certain  retirement  plans may also be eligible to purchase Class Y shares.  See
the Prospectus relating to Class Y shares.

EFFECTIVE MAY 1, 2005, THE  SUB-SECTION  "SMALL  ACCOUNT  POLICY" OF THE SECTION
"REDEMPTIONS"  IS RENAMED  "MINIMUM BALANCE POLICY" AND REPLACED IN ITS ENTIRETY
WITH THE FOLLOWING:

MINIMUM BALANCE POLICY

The Fund,  on an annual  basis,  may  deduct a  minimum  balance  fee of $20 for
accounts that fall below the minimum amount required to establish an account, as
described in the Fund's  Prospectus.  The fee is subject to change.  The minimum
balance fee is assessed by the automatic  redemption of shares in the account in
an amount  sufficient to pay the fee. The valuation of account  balances and the
deduction of the fee generally  occur during the third week in September of each
calendar year, although they may occur at a later date in the year. The fee will
not be deducted  from Fund  positions  opened  after June 30th of that  calendar
year. Certain accounts, such as accounts that fall below the minimum as a result
of the automatic  conversion  from Class B shares to Class A shares and accounts
using an IXIS Advisors Funds' prototype  document  (including IRAs, Keogh plans,
403(b)(7) plans and Coverdell Education Savings Accounts), are excepted from the
minimum balance fee.

In its  discretion,  the Fund may also  close an  account  and send the  account
holder the  proceeds  if the  account  falls  below the  minimum  amount.  It is
expected  that  accounts  maintained  by  intermediaries  through  the  National
Securities Clearing Corporation will be liquidated,  rather than assessed a fee,
if the account balance falls below the minimum required to open an account.  The
valuation of account balances and the liquidations generally occur in October of
each calendar  year,  although  they may occur at a later date in the year.  Any
account  opened  after June 30th of a  calendar  year will not be subject to the
liquidation for that calendar year.


                                                                      SP258-0505