I've heard that this happened due to them using an older version of Windows (Windows XP, that is), which doesn't get support anymore since 2014.
In December it was reported nearly all NHS trusts were using an obsolete version of Windows that Microsoft had stopped providing security updates for in April 2014. Data acquired by software firm Citrix under freedom-of-information laws suggested 90% of trusts were using Windows XP, then a 15-year-old system.
It is not known how many computers across the NHS today are still using Windows XP or recent variants Windows 8 and Windows 10.
So, what if this is Microsoft's scheme to make people update their Windows version to Windows 7, 8, 8.1 or 10? I know, it might sound crazy. So, it probably isn't so, but, what if?