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ws2k12r2 is still getting updates, what w10? ;)
In the meantime, Evolution has had EWS support for years… no Rust involved.
Radicale. Not the fastest, but has worked for years.
I use Evolution with the o365 account at work. All one needs is the EWS plugin and the company tenant ID. Evolution then pretends to be a generic MS Office app, using a well-known app ID. oauth2 works just fine.
Giving customers more control? Great.
Larry is a civil servant, he stays.