The contract will run for seven years, with the option for three one-year renewals.
"The idea is to provide services to every organization in state government," Unisys spokesman Brad Bass said Monday.
Any state agency can come to Unisys for information-technology services, Bass said.
After implementation is completed over the next 30 months, Pennsylvania will have one of the most extensive outsourced cloud-computing infrastructures among state governments, said Dan Egan, spokesman for the Office of Adminstration in Harrisburg.
The deal eliminates the need for state agencies to purchase computer servers and continues a consolidation of data centers that began in 1999 with Unisys, Egan said.
With the new contract, the last five state agencies with their own data centers -- the Departments of Health, Revenue, Labor and Industry, and Public Welfare and the State Police -- will become part of the Unisys-run data center in Harrisburg.
Those five data centers will be combined with a data "power house" and an "enterprise data center," both now in Harrisburg, Egan said.
Unisys will be responsible for running the consolidated data center and a back-up disaster-recovery data center in Virginia, Egan said.
He added that he believed the consolidation would lead to minimal, or perhaps no, state job cutbacks.
Unisys said it will partner with IBM and Deloitte Consulting on the project.