IMS LOGO

                                                                 January 9, 2003

Dear Stockholder:

     In November 2002, we announced a plan to dispose of our interest in
Cognizant Technology Solution Corporation by offering you, as an IMS Health
stockholder, the opportunity to exchange shares of IMS Health shares that you
own for Cognizant shares. We currently own 11,290,900 Cognizant shares.

     We are now formally launching this exchange offer. Specifically, we are
offering to exchange 0.309 Cognizant shares for each share we accept in the
exchange offer. The offer is scheduled to expire at 12:00 midnight, New York
City time, on February 6, 2003. The terms and conditions of the offer are
contained in the enclosed offering circular-prospectus. In addition, we have
prepared a Question and Answer section in the offering circular-prospectus that
responds to commonly asked questions about the exchange offer. You should read
all of the enclosed materials very carefully.

     We note that the exchange ratio represents a premium of 20% based on
closing prices on January 8, 2003. Of course, we cannot predict what the amount
of the premium, if any, will be at the closing of the exchange offer since the
market prices for IMS Health shares and Cognizant shares fluctuate.

     We have retained Georgeson Shareholder Communications Inc. as our
information agent, American Stock Transfer & Trust Company, as our exchange
agent, and Goldman, Sachs & Co. and Bear, Stearns & Co. Inc., as the joint
dealer managers for the exchange offer. For additional copies of the offering
circular-prospectus and related documentation you may contact the information
agent at (866) 203-1913 (toll-free) in the United States, or (212) 440-9800 from
elsewhere. You may also contact the information agent, exchange agent or the
joint dealer managers at one of the telephone numbers set forth on the last page
of the offering circular-prospectus for assistance with any questions you may
have about the exchange offer.

     I thank you for your continuing support of our company.

                                          Sincerely,

                                          David M. Thomas
                                          Chairman and Chief Executive Officer
                                          IMS Health Incorporated