MKS to Announce First Quarter Fiscal 2005 Results on September 9, 2004

Waterloo, ON—August 16, 2004: MKS Inc. (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 first quarter fiscal 2005 after close of market on September 9, 2004. The Company will hold a conference call at 5:00 p.m. EDT to discuss its first quarter performance.

Conference Call Details
Interested parties may access the call by dialing 1-888-280-8771 or 416-695-9702. An operator-assisted playback of the call will be available for one (1) week from September 9, 2004 to September 16, 2004 and may be accessed by dialing 1-888-509-0082 or 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.

Investor Contact:
Douglas Sawatzky, CFO
519-883-3252
Email: dsawatzky@mks.com