[inglor]

Microsoft mostly gives different groups autonomy in what tools to use, where to host etc.

Most groups in Microsoft use the Microsoft stack as it's best supported and already compliant and works pretty well - so most groups use teams, office, Azure etc.

Groups are free to use other tech and may for example use zoom+slack (some groups do) or GSuite. This is also true for technology (e.g. a team can use yarn and flow instead of npm and TypeScript). It's just very rare they do.

[pixel16]

This is not true. Microsoft uses teams heavily internally. Zoom slack and others banned unless it's a customer requirement

Source: msft employee

[k12sosse]

I engage frequently with the Canada Education team and office 365 national reps and they are wonderful and the way Microsoft uses their own stuff to interact with their customers is a true blessing. Teach by showing instead of telling.