Sony Ericsson Standardizes on MatrixOne's PLM Environment to Increase Competitive Advantage

Handset Company Will Increase Engineering Efficiencies and Accelerate Time-to-Market for New Mobile Communications Products with Global Deployment of Matrix10; PLM Platform Will Replace Many Disparate Systems

Westford, Mass. - July 21, 2004 - MatrixOne, Inc. (NASDAQ: MONE), a leading provider of collaborative product lifecycle management (PLM) solutions for the value chain™, today announced that Sony Ericsson Mobile Communications, a major provider of mobile communications products, has selected the Matrix10™ environment to enhance its competitive edge in the global mobile communications sector.

Matrix10 will provide a secure, collaborative product development environment across Sony Ericsson's global operations to dramatically accelerate product innovation and time-to-market by better managing internal resources, external suppliers and business partners.

The Matrix10 deployment will be rolled out across all of Sony Ericsson's global locations and will enable efficient collaboration with mobile network operators, outsourced manufacturing and design partners, including Flextronics and Sony Manufacturing. In addition it will streamline internal product design and development, enabling the company to quickly and cost-effectively bring new handsets to market.

"Our implementation of Matrix10 is a necessity in order for Sony Ericsson to stay ahead in an increasingly competitive market," said Colin Boyd, corporate vice president for IS/IT, Sony Ericsson Mobile Communications. "Sony Ericsson is customer focused, but the quality and efficiency of our engineering environment-which makes up more than half of the company-is key to the success of the company, and so we need powerful tools in order to increase productivity and reduce the lead time in bringing new products to market. By standardizing on Matrix10, Sony Ericsson can potentially replace numerous freestanding R&D systems with a single development operations platform. At its essence, Matrix10 will help us to develop better products cheaper."

A key objective of Sony Ericsson's global strategy is to work with leading global mobile operators in order to broaden the range of handset offerings and applications available to their customers. In a highly competitive marketplace, the ability to collaborate across its full product range is essential in expediting the design and manufacturing process, ensuring that Sony Ericsson provides the right products at the right time to operators and consumers. MatrixOne's Matrix10 PLM environment will be instrumental in facilitating this collaborative process.

"Sony Ericsson has been successful as a global player because of its consumer-focused strategy and technical expertise," said Mark F. O'Connell, president and CEO, MatrixOne. "The company understands that the challenges of bringing new products to market are increasing each day. The selection of Matrix10 as the backbone of their global product development efforts will help Sony Ericsson address these challenges in order to continue to increase their competitive advantage and grow market share through continued product leadership and innovation."

About Sony Ericsson
Sony Ericsson Mobile Communications AB offers mobile communications products for people who appreciate the possibilities of mobile technology. Established in 2001 by Telefonaktiebolaget LM Ericsson and Sony Corporation, the joint venture continues to build on the success of its two innovative parent companies. Sony Ericsson creates value for its operator customers by bringing new ways of using multimedia communications while mobile. The company's management is based in London, and it has employees across the globe working on research, development, design, sales, marketing, distribution and support. For further information, please visit: www.sonyericsson.com.

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.

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

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.