...
- From the Inbox tab, Right-click your email address and click Subscribe...
- Check the box next to each folder you want to see in Thunderbird, click Subscribe, then click OK.
- Make sure you subscribe to Drafts, Deleted Items, and Sent Items.
- Right-click your email address and select Settings.
- Under Server Settings, for When I delete a message, choose Deleted Items.
- Under Copies & Folders for When sending messages, automatically: select Other > Your Email > Sent Items
- Under Copies & Folders for Drafts and Templates, choose to Keep draft messages in: Other > Your Email > Drafts
- Under Junk Settings, Uncheck Enable adaptive junk mail controls for this account
- Under Server Settings, for When I delete a message, choose Deleted Items.
Thunderbird is now configured for use with your UT O365 email.
...