Sun Expands Solaris/SPARC CMT Innovation Leadership

Sun Microsystems, Inc. (Nasdaq: SUNW) today announced two advances that demonstrate its continued leadership in chip multi-threading (CMT) and commitment to advancing the SPARC(R) architecture. Sun successfully completed the tapeout (initial design completion for first fabrication) of its new "Rock" processor and announced that it's enhancing the performance, expandability and performance per watt of its Sun Fire(TM) T2000 servers.

"SPARC CMT and the Solaris(TM) Operating System (OS) are the foundations of Sun's business today and in the future," said John Fowler, executive vice president, Systems, Sun Microsystems. "The UltraSPARC(R) T1 chip put us way ahead of the competition in multi-core, multi-threaded processing, and generated tremendous interest in our SPARC products among customers. Now with Rock we're expanding CMT to the high-end. We'll be able to deliver the most optimized platform for high-end Solaris based applications, and offer industry-changing improvements in price performance across the entire datacenter."

Sun's New CMT Products

Rock and the enhanced Sun Fire T2000 servers continue Sun's leadership in CMT.

* Rock: The "Rock" processor is Sun's next-generation, high-end SPARC CMT

product line, and its design is focused on delivering the performance

and energy efficiency of CMT technology to high-end systems. The

successful completion of this critical milestone helps keep Sun on track

to deliver the first Rock-based systems in the second half of calendar

2008.

* Sun Fire T2000 enhancements: Sun is enhancing the performance,

expandability and performance per watt of its Sun Fire T2000 servers

with support for 64 GB of memory and the new faster 1.4GHz UltraSPARC T1

processor. By offering 64 GB of memory in both existing and new systems,

Sun is able to improve performance of memory-bound applications by up to

20 percent while enabling the T2000 servers to handle larger workloads

and greater levels of application consolidation.

The 1.4GHz UltraSPARC T1 processor has already demonstrated up to

30 percent higher throughput than the existing 1.2GHz processor, while

also extending Sun's leadership in datacenter performance and efficiency

by delivering 2x higher performance, 5x higher performance per watt and

9x SWaP than current competitive systems. These enhancements enable

customers to break through the power, cooling and space limitations that

blight many datacenters today, to serve millions of new customers while

saving millions of dollars in operational costs.

It is important to note that Sun is also making great progress on the Niagara 2 silicon, and is on target to deliver systems in the second half of calendar 2007.

Sun's CMT Leadership

In 2006, the SPARC product line enjoyed significantly increased revenue growth with the UltraSPARC T1. A year after the launch, the UltraSPARC T1- based T1000 and T2000 servers, running the Solaris 10 Operating System (OS), now represent more than $100 million in revenue per fiscal quarter for Sun, and have played a key role in helping Sun achieve three straight quarters of server revenue growth, according to the most recent IDC Worldwide Quarterly Server Tracker.

Sun continues to invest aggressively in CMT innovation, and remains on track to deliver the benefits of CMT technology across its entire product line -- from entry level to high end -- in the second half of calendar 2008.

About Sun Microsystems, Inc.

A singular vision -- "The Network Is The Computer" (TM) -- 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 .

NOTE: 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 in other countries. All SPARC trademarks are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the United States and other countries. Products bearing SPARC trademarks are based upon an architecture developed by Sun Microsystems, Inc.

Contact: Mark Richardson

(650) 257-4038

mark.richardson@sun.com

"Safe Harbor Statement

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, regarding the future results and performance of Sun Microsystems, Inc., including statements regarding Sun's commitment to advancing the SPARC architecture; the belief that SPARC CMT and Solaris are the foundations of Sun's business today and in the future; delivering the first Rock-based systems in the second half of calendar 2008; delivering its enhanced Sun Fire T2000 servers in the second half of calendar 2007; and delivering the benefits of CMT technology across its entire product line in the second half of calendar 2008. These forward-looking statements involve risks and uncertainties and actual results could differ materially from those predicted in any such forward-looking statements. Factors that could cause actual results to differ materially from those contained in our projections and forward-looking statements include: increased competition; failure to rapidly and successfully develop and introduce new products; our reliance on single-source suppliers; risks associated with our ability to purchase a sufficient amount of components to meet demand; inventory risks; risks associated with our international customers and operations; delays in product development or customer acceptance and implementation of new products and technologies; and our dependence on significant customers and specific industries. Please also refer to Sun's periodic reports that are filed from time to time with the Securities and Exchange Commission, including our Annual Report on Form 10-K for the fiscal year ended June 30, 2006 and our Quarterly Report on Form 10-Q for the fiscal quarter ended October 1, 2006. Sun assumes no obligation to, and does not currently intend to, update these forward- looking statements."

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