Disclaimer: I work at MSFT, views are my own, etc. I believe this is pretty much it. It is my understanding that there are a ton of features on a processor tod

Disclaimer: I work at MSFT, views are my own, etc. I believe this is pretty much it. It is my understanding that there are a ton of features on a processor today that are not simply the x86/amd64 instruction set. These things require the Hardware Abstraction Layer (HAL) to be updated in order to support them. This is all code written in x86/amd64 ASM in order to interface with the processor and MSFT simply will no longer backport this code to its older OSes.