TORONTO, ONTARIO--(MARKET WIRE)--Sep 15, 2008 -- Harris Computer Systems ("Harris"), a subsidiary of Constellation Software Inc. (Toronto:CSU.TO - News) is pleased to announce that the Agency of Health and Social Services for Monteregie ("Monteregie") has selected its PG Govern division's mobile homecare product suite for its Phase II regional pilot project for mobile homecare.

Monteregie selected PGGovern's mobile homecare solution to improve the efficiency and the quality of services provided by its clinical professionals. Among the largest agencies in the province of Quebec, Monteregie serves a territory of approximately 10 000 square kilometers and provides services to over 1,300,000 residents.

"PGGovern is extremely pleased to have Monteregie as a client and partner. Monteregie has a long and impressive history of providing quality service to its residents and we are excited to be a part of the Monteregie initiative to drive further improvements in home healthcare. We look forward to a long and successful partnership with the Monteregie, stated Daniel Desaulniers, General Manager for Harris' PGGovern Business Unit.

Based on the current implementation schedule, the PGGovern solutions are expected to go live in 2008.

About Harris:

Harris is a leading provider of utility customer information systems (CIS), financial management, revenue management, health care management and land management software solutions. Since 1976, Harris has focused on providing feature-rich and robust turnkey solutions to public power and water markets as well as all levels of local government throughout North America. Harris' focus is on creating long-term relationships with our customers and ensuring that we meet the changing needs of our customers over time. For further information on Harris Computer Systems, please visit our website at http://www.harriscomputer.com, or call 888-847-7747.

About Constellation:

Constellation's common shares are listed on the Toronto Stock Exchange under the symbol "CSU". Constellation Software is an international provider of market leading software and services to a number of industries across both the public and private sectors. The Company acquires, manages and builds vertical market software businesses that provide industry specific mission-critical software solutions.

     Contacts:
     Constellation Software Inc.
     John Billowits
     Chief Financial Officer
     (416) 861-2279
     Email: info@csisoftware.com
     Website: http://www.csifsoftware.com