Given that Windows 7 is still in Microsoft's regular update and security maintenance period, it will not be completed until January 2020, there are still two years, but for large organizations, the rapid upgrade of Windows 10 is still imminent.
First of all, NHS such a national agency to upgrade the replacement of Windows is a very complicated matter, both technical and non-technical steps are complicated, hardware and software are problems, not two years at all.
Secondly, Windows 7 has brought a lot of trouble to NHS, especially last year's WannaCry ransomware virus attack, NHS also a large area trickery, but the only direct immune virus system was Windows 10.
Data show that 74% to 76% of computers in different departments of NHS are still running Windows 7 and only 1-3% have upgraded to Windows 10.
However, NHS is committed to fully deploying Windows 10 until the end of Windows 7 support, and is in the process of communicating with Microsoft to prepare for the upgrade.
Not long ago, NHS also to get rid of Windows XP move it, this upgrade to Windows 10 will inevitably not be easy.