MKS to Announce Fourth Quarter Results June 5, 2002

Waterloo, ON - May 8, 2002: MKS Inc. (MKS) (TSE:MKX), a leading provider of tools to manage and control the software development process, today announced that it will report earnings for the fourth quarter 2002 after close of market on June 5, 2002. The company will hold a conference call at 5:00p.m. EST to discuss the fourth quarter and yearly financial results, business highlights and outlook.

Interested parties may access the call by dialing (877) 323-2093 (domestic) or (416) 695-9709 (international). A rebroadcast of the call will be available for one (1) week following the call during the hours of 7am-11pm. This rebroadcast is an operator-assisted call. The rebroadcast may be accessed by dialing (888) 509-0081 or (416) 695-9728.

About MKS
MKS Inc. ("MKS") (TSE:MKX) provides software solutions enabling development teams to analyze, build and deploy traditional and web-based software systems quickly and reliably. The company's award-winning family of MKS Integrity software configuration management (SCM) products, offer advanced technology with robust workflow, code management, and impact analysis capabilities. MKS also provides interoperability solutions under its popular MKS Toolkit brand for UNIX-Windows co-existence, cross-platform development, 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).

Douglas Sawatzky, Chief Financial Offier

MKS Inc.

Phone  519-883-3252