Constellation Software Inc.

Constellation Software Inc.

March 31, 2009 17:00 ET

Guyana Power & Light Inc. Selects Advanced Utility Systems, a Subsidiary of Constellation Software's Harris Subsidiary

TORONTO, ONTARIO--(Marketwire - March 31, 2009) - Harris Computer Systems ("Harris"), a subsidiary of Constellation Software Inc. ("Constellation") (TSX:CSU) is pleased to announce that Guyana Power & Light Inc. ("GPL") has selected Advanced Utility Systems' CIS Infinity® to replace its legacy customer information and billing (CIS) solution.

GPL is the main supplier of electricity to the country of Guyana, South America. Based in Georgetown, Guyana GPL provides electricity to 130,000 customers throughout the country.

Once live, CIS Infinity® will provide GPL with in-depth reporting capabilities, robust customer service functionality and interoperability with other core GPL systems.

Implementation of CIS Infinity® is scheduled to begin in April 2009.

About Advanced and Harris:

Advanced is a wholly-owned subsidiary of Harris Computer Systems that provides Customer Information and Billing solutions exclusively to utilities and municipalities. Harris is a leading provider of financial management and Customer Information Systems (CIS) software solutions. Since 1976, Harris has focused on providing feature-rich and robust turnkey solutions to all levels of local government as well as public power and water markets 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 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 mission-critical software solutions to address the specific needs of its customers in those industries.

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