SANTA CLARA, Calif., June 22, 2005 -- Continuing its financial services momentum, Sun Microsystems, Inc. (Nasdaq: SUNW) today announced that the D. E. Shaw group, a specialized investment and technology development firm, will use Sun servers to run the complex financial analysis applications and molecular modeling and other life sciences simulations utilized by the firm's in-house research staff. The financial applications will run on the Solaris 10 Operating System (OS).

Based on its long-term historical success with Sun, the New York-based D. E. Shaw group purchased more than 1,700 x64-based Sun Fire servers powered with AMD Opteron processors for its massive grid computing environments. The firm will deploy the financial services compute grid on Solaris 10 OS.

"Our success depends on running complex applications that require advanced computing power," said Peter Reiss, Senior Vice President of D. E. Shaw & Co., L.P. "Sun's advancement with Solaris 10 and expertise in grid computing will help us achieve our computational goals and develop best-in-class quantitative analysis solutions while reducing our operational and financial risk."

"We're seeing more and more leading financial services companies relying on Sun to support business critical applications. Our success with the D. E. Shaw group further exemplifies our strong position in the marketplace and shows how Sun can work with diverse companies in this sector," said Stuart Wells, executive vice president, Strategic Development and Sun Financing, Sun Microsystems, Inc.

About Sun Microsystems, Inc.

A singular vision -- "The Network Is The Computer" -- guides Sun in the development of technologies that power the world's most important markets. Sun's philosophy of sharing innovation and building communities is at the forefront of the next wave of computing: the Participation Age. Sun can be found in more than 100 countries and on the Web at http://sun.com.

Sun, Sun Microsystems, the Sun logo, Sun Fire, Solaris and The Network Is The Computer are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. AMD, Opteron, theAMD logo, the AMD Opteron logo are trademarks or registered trademarks of Advanced Micro Devices.