A must-have Add-On! Rated 5 out of 5 stars

I am an old-time Eudora user.. So long ago that I bought it off the shelf, in a box! I later upgraded to the freeware ad-supported version. When it was time to move on to Thunderbird recently I wanted to be sure that I imported all my older messages and such. I imported the early version files into the intermediate version, then imported that into the current 3.0.4 T'bird. As you can imagine there were a LOT of duplicate messages. Trying to organize messages by folders and years made it worse. I found "Remove Duplicate Messages (Alternate) 0.3.3" and it found well over 1,600 duplicate messages. Can you imagine how long it would take to deal with that manually? "RDM alt" did the job easily in minutes helping make migration to Thunderbird a lot easier. .

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