Of course, this does bring up the Internet theory that all mail clients will always suck in their own peculiar ways.

Edit: As evidenced by the fact that it's often easier for me to telnet to my mail server's IMAP port and issue IMAP commands directly than to figure out why my MUA won't delete a folder. All it's got to do is issue ``. delete INBOX.Trash''. Piece of crap. Not to mention the bigger piece of crap that decided I needed a Trash folder.