MONE Matrixone (MM)

MatrixOne, Inc. (NASDAQ: MONE), today announced that the filing of its Quarterly Report on Form 10-Q for the third quarter ended April 2, 2005 will be delayed beyond the Securities and Exchange Commission's filing deadline of May 12, 2005 to provide additional time to complete the review of the Company's revenue recognition practices as previously announced on April 26, 2005. The review, which will address fiscal year 2005 and earlier periods, is not complete and may uncover other findings as previously announced. The Company currently cannot estimate when this review will be completed. As soon as practicable following the completion of this review, the Company will file its Quarterly Report on Form 10-Q for the quarter ended April 2, 2005. 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. MatrixOne (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. Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995 -- Forward-looking statements in this release do not constitute guarantees of future performance. Such forward-looking statements 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 expected financial and operating results. The risks and uncertainties that may affect forward-looking statements include, among others: unforeseen issues encountered in the review of our revenue recognition practices and the completion of our quarterly financial review, difficulties in growing our customer base, difficulties leveraging market opportunities, difficulties providing solutions that meet the needs of customers, poor product sales, long sales cycles, difficulty developing new products, difficulty in relationships with vendors and partners, higher risk in international operations, difficulty assimilating acquisitions, difficulty managing rapid growth, and increased competition. For a more detailed discussion of the risks and uncertainties of our business, please refer to our periodic reports and registration statements filed with the Securities and Exchange Commission, including our Annual Report on Form 10-K for the fiscal year ended July 3, 2004, our Registration Statement on Form S-3 filed on September 29, 2004 as amended, and our Quarterly Report on Form 10-Q for the fiscal quarter ended January 1, 2005. The forward-looking statements included in this press release represent our views as of May 12, 2005. We anticipate that subsequent events and developments may cause our views to change. We assume no obligation to update any forward-looking information contained in this press release or with respect to the announcements described herein.