Constellation Software Inc. Acquires Common CENTS(R) Solutions, Inc.

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(R) 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(R) will provide GPL with in-depth reporting
capabilities, robust customer service functionality and interoperability with
other core GPL systems.


Implementation of CIS Infinity(R) 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
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 mission-critical software solutions to address
the specific needs of its customers in those industries.