I used to use Evolution until MAPI was removed, then Thunderbird+Exquilla for a bit, but now Thunderbird+IMAP is the sensible way to go. I make all my email rules server-side using OWA, and Thunderbird has had most of the OAUTH2 growing pains sorted out for a while now.

We use Teams, which handles all the calendar stuff I used to need my mail client to do for me. The only risk seems to be Microsoft silently changing something and Thunderbird being left to figure out what to fix. I no longer need to access proprietary Public Folders, as that functionality has been swallowed up by Sharepoint Online.

I've used Linux at work for the past decade, in spite of it being a Microsoft shop -- some days I would wrestle with HyperV or whatever ricketysticks thing Microsoft bolted on top of HyperV, some other rare days I'd get to play in the terminal all day.

I could tolerate using Windows if I was forced to. But I absolutely love using Linux. Who even needs Outlook specifically these days?