Depends what market you are in. In the UK I would estimate M365 usage is ~100% of local/national govt.

And in terms of classic 'corporate' sectors like law, finance, etc, it also close to 100%.

Whereas in "tech" it is far more likely to be Gmail.

I _still_ get people who are non technical that work in 'corporate' sectors that can't join a Google Meet because they think it is Teams. They literally haven't ever used a Google meeting before.

Rackspace?

Every government globally with all parts and agencies is purely microsoft. Some EU states are trying to move away from it for obvious reasons (not this event, more like national security and sovereignty which you don't have with MS products).

Exchange and Active directory are the biggest obstacles by far, bureaucrats can learn how to work with open source office alternatives easily, and underlying OS can be anything as long as you have few icons to click on.

> Zimbra, IBM WebSphere Lotus Notes Blue For Enterprise XML Watson Edition et al

I see that you're a hater. Outlook sucks but your solution is to cure cancer (Outlook) with Alzheimer's (Zimbra, Lotus Notes)?