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"Changes the "Send Later" command (Ctrl+Shift+Return) in the message composition window, so that instead of merely copying the message into your Outbox so that it is sent the next time you go online or do "Send Unsent Messages", a dialog pops up which allows you to specify when the message will be sent. You can specify a specific time and date, or click "15 mins later", "30 mins later" or "2 hours later", or click "Passthrough to Send Later" to get the built-in Thunderbird "Send Later" functionality (i.e., copy to Outbox)."

"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."