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I am switching hosts and since I want to keep all the emails I have so far, I had to switch to POP3 (another TB nightmare). I ran this extension and I think it removed some, but it it left many more duplicates - yes, duplicates, same message.

Это отзыв для предыдущей версии этого дополнения (0.3.5). 

I often get this complaint. And it's always the case that the messages are just similar, not the same: An extra newline, a few seconds time difference etc. Try using fewer comparison criteria...