Rated 3 out of 5 stars

In principle a good tool. I've tried it with TB 3.0.3 together with Remove Duplicate Messages (Alternate) 0.3.4.
But I've got the problem that duplicates on an IMAP Server cannot be found. I think that it is related to the new feature of TB 3.x.x where for a search on a host the Flag "Run search on server" has to be marked. This might also influence the work of Remove Duplicate Messages (Alternate) .

This review is for a previous version of the add-on (0.3.3).