May 5, 2008

Dear Synopsys Customer:

If you are using the Synopsys TCAD Sentaurus product on the Microsoft Windows platform please read this letter carefully.

Due to the decline in the demand of the Windows platform for TCAD Sentaurus, the Synopsys TCAD Sentaurus products release A-2007.12, was the final shipping release for this platform. Subsequent new releases will no longer support the Microsoft Windows platform.

TCAD Sentaurus PCM Studio and TCAD Sentaurus Lithography products will continue to support the Microsoft Windows platform.

By providing you with this notice, we hope to help minimize your inconvenience in implementing this change. If you are affected by this change, Synopsys is available to assist you in the migration of your Synopsys products to another supported compute platform.

General information on compute platforms and versions supported by Synopsys products is available at the Synopsys web site here.

Please refer to the TCAD Sentaurus product documentation for product specific information concerning compute platform support.

If you have any further questions or need assistance, please feel free to contact your local Synopsys CAE or Account Team.

Thank you for your continued support.

Sincerely,

Richard Paw
Compute Platforms Alliance Manager
Synopsys, Inc.