MATRIXONE TO SUPPORT SUN´S SOLARIS

MATRIXONE TO SUPPORT SUN´S SOLARIS OPERATING SYSTEM X86 PLATFORM EDITION AND X86 SYSTEMS

Sun Keynote at MatrixOne Global Customer Conference Highlights How Customers Are Leveraging Low-Cost Computing Strategies to Reduce Total Cost of Ownership

MatrixOne Global Customer Conference, Orlando, Fla. -- February 2, 2004 -- MatrixOne, Inc. (NASDAQ: MONE), a leading provider of collaborative product lifecycle management (PLM) solutions for the value chain and Sun Microsystems, Inc., (Nasdaq: SUNW) today announced a joint program to deliver MatixOne PLM solutions on Sun´s x86 systems, including Sun´s forthcoming AMD Opteron processor-based systems. This new offering will extend MatrixOne´s support for Sun´s Solaris 9 Operating System (OS) and the Sun Java Enterprise System, enabling customers to effectively leverage high-performance, highly scalable, low cost platforms for their PLM implementations.

The two companies made the announcement today from MatrixOne´s Global Customer Conference (GCC2004), an event gathering hundreds of the company´s customers, PLM industry experts and thought leaders. As part of his keynote presentation at the conference, John Loiacono, vice president, Operating Platforms Group, Sun Microsystems, spoke about how making packaged PLM solutions available on low-cost computing platforms, provides new alternatives that reduce the total cost of ownership of PLM deployments.

˝Deploying an effective PLM environment to enable collaborative product development across partners, suppliers, and customers is critical,˝ said Loiacono. ˝By combining the strengths of MatrixOne PLM solutions with the scalability and security of Sun´s Solaris OS and Java Enterprise System running on our x86 systems and AMD Opteron processor-based systems, customers now have the low cost infrastructure platform they need to build and deploy innovative PLM solutions. Also, customers can now rapidly scale those solutions as their businesses grow to improve productivity and cut costs across the entire value chain.˝

˝MatrixOne is committed to providing its customers with the products they need in order to have successful PLM implementations,˝ said Sam Zawaideh, vice president of products and solutions at MatrixOne, Inc. ˝Our global customer base is continually looking at ways to transform their business by embracing strategies such as outsourcing product design efforts to offshore partners. This requires the reliability and performance that Sun´s Solaris OS-based systems offer. By extending our support to x86 servers, customers will now have more flexibility and reduced risk in their deployments.˝

About MatrixOne

MatrixOne, Inc. (NASDAQ: MONE) is a recognized leader in delivering collaborative Product Lifecycle Management (PLM) solutions. We provide flexible solutions that unleash the creative power of global value chains to inspire innovations and speed them to market. MatrixOne´s customers include global leaders in the aerospace and defense, automotive, consumer products, high technology, life sciences, machinery, and the process industries, including Agilent Technologies, General Electric, Honda, Johnson Controls, Philips, Procter & Gamble, Siemens, and Toshiba. MatrixOne (http://www.matrixone.com/) is headquartered in Westford, Massachusetts with locations throughout North America, Europe, and Asia/Pacific.

About Sun Microsystems, Inc.

Since its inception in 1982, a singular vision -- ˝The Network Is The Computer˝ -- has propelled Sun Microsystems, Inc. (Nasdaq: SUNW) to its position as a leading provider of industrial-strength hardware, software and services that make the Net work. Sun can be found in more than 100 countries and on the World Wide Web at http://sun.com

Forward-looking statements in this release are subject to risks and uncertainties that could cause our actual results to differ materially from those anticipated. Such statements may relate, among other things, to our plans, objectives and expected financial and operating results. The risks and uncertainties that may affect forward-looking statements include, among others: poor product sales, long sales cycles, difficulty developing new products, difficulty in relationships with vendors and partners, higher risk in international operations, difficulty assimilating future acquisitions, difficulty managing rapid growth, and increased competition. For more about the risks and uncertainties of our business, see our periodic and other S.E.C. filings.

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MatrixOne, the MatrixOne logo are registered trademarks, and Matrix10, ˝a leading provider of collaborative product lifecycle management (PLM) solutions for the value chain,˝ MatrixOne Program Central, , MatrixOne Sourcing Central, MatrixOne Supplier Central and MatrixOne Engineering Central are trademarks of MatrixOne, Inc. All other trademarks and service marks are the property of their respective owners.

Sun, Sun Microsystems, the Sun Logo, Solaris, Java, and The Network Is The Computer are trademarks of Sun Microsystems, Inc. in the United States and other countries.

AMD, AMD Opteron, and combinations thereof, are trademarks of Advanced Micro Devices, Inc.