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Rated 1 out of 5 stars
I had a folder of 1760+ messages that included dupes. I ran this extension on it and it said that 600+ messages were dupes, leaving 1100+ good messages. I told it to do the default action and delete the 600+ messages. What was I left with? Exactly 1000 messages! What happened to the remaining 100+ messages? Good thing I copied the messages to another folder for backup before I used this extension.
It seems this extension has a 1000 message limit. If you've got more messages than that, DO NOT USE THIS EXTENSION!