No Security Updates for Old Operating Systems | Windows
Microsoft has confirmed that it’s not going to update previous operating systems for next-generation processors. This means that if you have a PC with a next-gen processor, you will not be able to use any other Microsoft OS except Windows 10.
There’s an important distinction here that needs to be understood. This policy change doesn’t mean that Microsoft is going to stop support Windows 8.1 and Windows 7. They will continue to receive latest software and security updates from the company, but they won’t be updated to work with newer processors. Even Intel’s current-generation Skylake processors won’t have support for the previous versions.
However, Microsoft will maintain a list of approved Skylake systems for enterprise customers, those systems will have guaranteed support for Windows 7 and Windows 8.1 until July 17th, 2017. It’s giving enterprise customers a grace period of 18 months to purchase new hardware before fully moving to Windows 10. After the grace period expires it will only provide them with “the most critical” security updates for the previous versions of Windows.