MKS to Announce Fourth Quarter and Fiscal 2004 Results on May 27, 2004

Waterloo, ON - May 6, 2004: MKS Inc. (MKS) (TSX:MKX), a leading provider of enterprise software configuration management (SCM) solutions for the Global 1000, today announced that it will report results for the fourth quarter and fiscal 2004 after close of market on May 27, 2004. The Company will hold a conference call at 5:00 p.m. EDT to discuss its fourth quarter performance and fiscal 2004 results.

Conference Call Details
Interested parties may access the call by dialing 1-888-280-8771 or 1-416-695-9702. An operator-assisted playback of the call will be available for one (1) week from May 27, 2004 to June 3, 2004 and may be accessed by dialing 1-888-509-0082 or 1-416-695-5275.

About MKS
MKS Inc. ("MKS") (TSX: MKX) provides award-winning enterprise software configuration management (SCM) and interoperability software solutions enabling Global 1000 companies to better manage and control the complete process of software development. The company’s family of SCM products offers advanced technology with robust workflow, version control, and impact analysis capabilities. Under its widely known MKS Toolkit® brand, MKS provides UNIX-Windows co-existence, and system administration that significantly cut development and administrative costs and reduce time to market while enabling enhanced performance. Founded in 1984 with over 10,000 customers worldwide, MKS has built its brand on the foundation of advanced technology, superior quality and extraordinary customer service. More information about MKS can be found at http://www.mks.com, or by calling 1-800-265-2797 (US & Canada), +49-711-351775-0 (Germany), and +44-1483-733900 (United Kingdom).

Copyright © 2004 MKS Inc. MKS and design, and MKS Toolkit are registered trademarks of MKS Inc. All other trademarks mentioned in this release are the property of their respective owners.

This news release contains forward-looking statements that involve risks and uncertainties, which may cause actual results to differ materially from the statements made. When used in this document, the words "may", "would", "could", "will", "intend", "plan", "anticipate", "believe", "estimate", "expect" and similar expressions are intended to identify forward-looking statements. Such statements reflect the Company’s current views with respect to future events and are subject to such risks and uncertainties. Many factors could cause our actual results to differ materially from the statements made including those factors detailed from time to time in filings made by the Company with Canadian securities regulatory authorities. Should one or more of these risks or uncertainties materialize, or should assumptions underlying the forward looking statements prove incorrect, actual results may vary materially from those described herein as intended, planned, anticipated or expected. The Company does not intend and does not assume any obligation to update these forward-looking statements.

Douglas Sawatzky, CFO

519-883-3252