Microsoft's operating system accounts for a vanishingly small percentage of server hosting, and their deathgrip on personal computing is starting to slip. (Particularly as Android has already replaced Windows as the most popular operating system.)

Microsoft is well past "not worried", looking at "too late to do anything about it" in the rear view mirror, and barreling toward "cease to exist if they don't continue to stick the landing on interoperability with Linux and Android".

Microsoft's long term relevance plan counts on cloud tools on Linux and their Office Suite on every platform.