The Windows developer is ending support for the XP version of its desktop operating system on April 8.
However, the Government has signed a deal with the company to extend support for 12 months beyond this date. The extension is said to have cost £5.5 million, with the Dutch government also agreeing a similar deal.
Thousands of computers will still need to be upgraded in the public sector, with website eHealth Insider calculating in September 2013 that 85% of the 800,000 computers in the NHS are still running XP. In contrast, only 1% were running the latest version of the software, Windows 8.