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"The old 'Remove Duplicate Messages' is missing important features, and does not have a free software license. This is a full rewrite, with an GPL-LGPL-MPL license. Performance has been improved and many features and capabilities have been added, including: - Choice of comparison criteria (subject, author, date, etc). - Comparison of message bodies. - Action on multiple folders. - Review dialog for double-checking which duplicates to delete and which to keep. - Good performance on local folders with large number of messages; reasonable performance with IMAP and RSS accounts. - Spiffy toolbar button+menu."