Chris:
And what are some pros and cons switching to IMAP?
Wolfgang Pfeiffer:
Why should I need IMAP?
With `fetchmail', that I use, it seems I can even keep emails on the remote POP server - I usually just don't need that.
Although you can leave mails on a server with POP3, and just read newer ones, it's not designed for that usage pattern. It can be very painful, and fail spectacularly. There's nothing stopping a server renumbering your messages, then there's no correlation between what you've already got and not yet seen.