The U.K.’s National Health Service (NHS) has signed a software licensing deal with Microsoft Corp. that the NHS says will provide for the development of a user interface specifically designed for the organization while also providing substantial cost savings for the multi-billion pound project, it was announced Wednesday.

The licensing agreement between the NHS and the Redmond, Washington, company, allows health service and Department of Health workers to use Microsoft’s desktop and mobile computing software on up to 900,000 computers, up from 500,000 in its previous agreement. Financial details of the agreement were not disclosed.

The NHS National Programme for IT (NPfIT), which is overseeing the upgrade of the NHS and Department of Health’s IT infrastructure, claims the new software licensing agreement will save the U.K. government