Rated 1 out of 5 stars

It works, and that is about all I can say. It causes issues with compaction which result in pop up errors every hour or so. Also, it is so heavy on disk IO that if you do not have an SSD don't even think about it. Every time I click in a folder with more than 2 or 3 new messages, would hang thunderbird for 3 or 4 minutes all the while pounding on the disk. Basically unusable. Support request went unanswered, so I uninstalled and now use davmail, which has none of the above issues and is completely free.

This review is for a previous version of the add-on (45.0.1161).