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>Google's Android is the largest OS by usage.

I am primarily thinking about government institutions and corporations. There Microsoft is used almost everywhere.

Mobile phones are a secondary issue in my opinion, also because Android is already much more open than Windows.

There's an attempt to move away from Microsoft enterprise tools, e.g. 365+ ecosystem.

See opendesk.eu , it's a platform collaborating with many EU open-source developers, and it's funded primarily by the German government.