Radicale. Not the fastest, but has worked for years.
efscher
joined 10 months ago
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.
I've been using Miniflux for a few years now, no complaints. Mostly with an iOS-based Reeder app, occasionally with the Web frontend.
Giving customers more control? Great.
WPS Office and FreeOffice. Each with their own caveats, but one just might work for you.
The Twenty Days of Turin, by Giorgio de Maria
In the meantime, Evolution has had EWS support for years... no Rust involved.