Rated 5 out of 5 stars

It works very well.

Since Office365 moved to OAuth2 ("Modern Authentication"), I had to remove the existing Office 365 account and re-add it. This worked and now my calendars are syncing once again.

Removing calendars did not work: I needed to remove the account in the TBSync account manager and re-add it.

This review is for a previous version of the add-on (4.3).