Microsoft must make 40% of their revenue off of Azure at this point. I would not be surprised if more than 50% of that is on Linux. Windows is probably down to 10% ( around the same as gaming ).
Sure there are people in the Windows division who want to kill Linux and some dev dev folks will still prefer Windows. At this point though, a huge chunk of Microsoft could not care less about Windows and may actually prefer Linux. Linux is certainly a better place for K8S and OCI stuff. All the GPT and Cognitive Services stuff is likely more Linux than not.
Do people not know that Microsoft has their own Linux distro? I mean an installation guide is not exactly their biggest move in Linux?