We just got several Motroola Droids here and not being an M$ house and calendar still being Oracle CollabSuite, we configured IMAP for email.
Problem is, every message sent from the phone results on a new copy being added to the Sent folder on EVERY connect. If the phone is set to sync every 5 minutes, you get a copy of the email every 5 minutes.
Working with support on this as we need to find a resolution QUICK to determine if we need to return these phones. Exchange is not working either (see bug https://bugzilla.zimbra.com/show_bug.cgi?id=42482).
Seems to be an imap issuue. The message has the same MSGID for all copies.