How many percent of their revenue funel are dependent directly or indirectly on windows beeing the peoples workstation funneling them towards their subpar products?
Probably some amount. I agree Windows is strategic, but do definitely could see them giving it away and/or fully open sourcing it.
In the Enterprise, they'll fight tooth and nail to maintain that synergy. In the small business and consumer markets, people are having a very slow divorce from Windows, and Microsoft is well aware. MS365 is an ok product and can absolutely thrive on its own without Windows.