I’ve been using Thunderbird with outlook.com / office 365. So basically Thunderbird with Exchange via IMAP.
It’s been working relatively well. One little annoyance was that difference in naming folders:
- Trash vs. Deleted Items
- Junk vs. Junk Email
- Sent vs. Sent Items
Sent folder can be renamed in Thunderbird via the GUI but remarkably renaming of the Trash folder is not supported.
I accidentally stumbled upon a link explaining how to change the naming of the trash folder in Thunderbird: