http://www.theverge.com/2016/1/16/10780 ... rs-skylake
The policy change not only makes Microsoft's hardware partners happy — they no longer are on the hook to develop as many costly software updates for past versions of Windows — but it also helps Microsoft push adoption of Windows 10. The company sees the operating system as the "final" version of Windows; it's now a service, not a product, and this change better reflects that. There's only one current version of Windows, and while Microsoft will fullfill its legacy hardware obligations, it won't be expending resources to help users steer clear of its latest and greatest.