Sears will outsource its IT infrastructure support services to Computer Sciences (CSC).
In a 10-year deal worth $1.6bn (£867m), CSC will support Sears' desktops, servers, data networks, data analysis systems and web-related systems.
Sears will remain in charge of its technology standards, architecture and service policies.
From 12 June, most of the 200 Sears IT employees in charge of the tasks being outsourced will be hired by CSC.
Sears expected that CSC will improve the operations of its IT infrastructure by making it more stable, keeping it more updated and running it more efficiently and economically.
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Sears, which had revenue of $41.1bn in 2003, believed this agreement will allow its IT department to focus on IT work that is specifically related to the company's retail business.
CSC is one of the world's largest providers of IT services with $14.8bn in revenue in its 2004 financial year, which ended on 2 April.
Juan Carlos Perez writes for IDG News Service