For starters, it tries to do one of the things you do with IMAP over POP, which is to save a copy of your sent mail - mail you send via SMTP goes into your INBOX. SO you end up downloading back to your client a copy of all mail you send. That's just bloody stupid and a piss-poor design.

The mail client can't delete mail from the POP server. I haven't read the POP RFC in years, but I've never connected to any other POP server where the mail client was prevented from deleting mail on its own accord.

Yeah, there's more... Anyway, I'm traveling and currently in Nova Scotia so I'm trying not to spend too much time online. Just enough to deal customers mostly.