Fujitsu will provide support and services to 140,000 desktops across the UK as part of a £300m-plus deal with the Department for Work and Pensions (DWP).
The supplier, which replaces HP/EDS, plans to use thin client technology to cut the DWP's desktop IT costs.
Because applications are centralised, there should be less need for desk-side support, and hardware costs will drop because thin clients are cheaper than full PCs.
Fujitsu also expects to save tens of millions of pounds on energy costs as thin clients use less power than PCs.
Joe Harley, DWP IT director general and chief information officer, said, "[Thin clients] provide a number of benefits, including little or no maintenance required to the kit and reductions in power consumption, which supports our sustainability agenda."
There will be more contracts up for grabs as the department looks to replace its IT and telephony infrastructure, added Harley.
"This is the first in a series of competitions to replace our existing IT and telephony services contracts by 2015 and it sets the tone by delivering significant benefits for the department and as a framework for government-wide IT."
- The DWP has 140,000 desktop devices across more than 1,000 locations in the UK
- Following a phased transition, Fujitsu will assume responsibility for the service on 1 September 2010
- Fujitsu is working with suppliers including EMC, Citrix, Microsoft and Appsense on the contract