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by Spooky23 2538 days ago
I don’t remember the particulars, but I know that all of the identity components of Exchange Online and O365 were swapped out once or twice. Microsoft built the airplane in flight.

They also have a very complex service delivery architecture. O365 “Commercial” and “Government Community”, share some components, and have separate ones for others. Then there is a separate US Gov O365 with a different TLD.