I am having a strange problem with the new mail.app in leopard and my IMAP server of my university. I set all the setting the same but it acts very strange with the downloaded messages. If the message is moved from the inbox, it will download the message multiple times. Also, it fails to act like an IMAP inbox but syncing messages that are read and/or deleted. Sort of acting like a one-way sync getting messages from the server but never reporting the changes back. I have it setup in entourage and thunderbird but would prefer to use mail.app.