TRANSFER AGENCY AND SERVICE AGREEMENT

                                February 28, 2006

Boston Financial Data Services, Inc.
66 Brooks Drive
Braintree, Massachusetts 02184

Dear Sirs:

                  In accordance with Article 10 of the Transfer Agency and
Service Agreement, dated February 1, 2001 (the "Agreement"), between Credit
Suisse Trust (the "Trust") and Boston Financial Data Services, Inc. ("BFDS"),
the Trust hereby notifies BFDS of the Trust's desire to have BFDS render
services as transfer agent under the terms of the Agreement with respect to the
Commodity Return Strategy Portfolio, a series of shares of the Trust.

                  Please confirm that the foregoing is in accordance with your
understanding by indicating your acceptance hereof at the place below indicated,
whereupon it shall become a binding agreement between us.

                                          Very truly yours,

                                          CREDIT SUISSE TRUST

                                          By:/s/J. Kevin Gao
                                             ---------------
                                             Name: J. Kevin Gao
                                             Title: Vice President and Secretary

Accepted:

BOSTON FINANCIAL DATA SERVICES, INC.

By:_________________________________
   Name:
   Title: