Jumping in a bit out of place, I too would rather have mail retrieval setup on POP3, rather than IMAP, with the setting of keep a copy of messages on the server. IMAP's synchronization process can be painfully slow (I now wait 10 minutes to use Outlook, with only 4000 messages in my inbox and subfolders), and many of my users are connecting from remote locations. I do appreciate the folder capabilities, but at times I wonder if it's worthwhile.
-- Alaskamatt