Comment on MailSteward

Does not seem to install on Snow Leopard :-(. Works great though on 10.5. One thing to note regarding IMAP is that MailSteward accesses the offline copy of the data rather than the actual IMAP mailbox.
This may be confusing if you have Apple Mail set to not download all of the messages, i.e. it claims "DONE" after archiving 300 of your 10000 messages.