The Compliance Issue: MatrixOne Delivers Call to Action for Driving Regulatory Compliance within the Product Lifecycle at Europe

MatrixOne, Inc. (NASDAQ: MONEE), a leading provider of
collaborative product lifecycle management (PLM) solutions for the
value chain(TM), today announced that Mike Adami-Sampson, vice
president product strategy, will give a presentation at Europe's first
independent cross-industry product lifecycle management forum, taking
place June 22-23, 2005.
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Who:   Mike Adami-Sampson, vice president, product strategy

What:  The European PLM Summit 2005 gathers the world's leading 
       companies together for the very first time to learn the lessons
       of global PLM implementations from world-class organisations.

When:  The European PLM Summit 2005 will take place June 22-23, 2005.
       Mike Adami-Sampson is scheduled to present on Wednesday, 
       June 22, at 10.45 a.m.

Where: ExCel, Docklands, London E16, UK

Topic: Mike Adami-Sampson will be presenting on the topic of 
       "Compliance - Doing What You Need To Do."  His presentation 
       will focus on the dimensions of regulatory/environmental 
       compliance that have an impact on the lifecycle of products and
       best practices for managing this complex aspect of product 
       development.  Adami-Sampson will discuss how to proactively 
       identify ELV, ROHS and WEEE compliance issues early in the 
       design process, helping companies and their supply chains 
       manage product development costs under new regulations.
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   About MatrixOne

   MatrixOne, Inc. (NASDAQ: MONEE) 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.

   MatrixOne and the MatrixOne logo are registered trademarks and "a
leading provider of collaborative product lifecycle management (PLM)
solutions for the value chain" is a trademark 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.