You mean you want to set up OE6 to access mail via an IMAP server? It should be pretty straightforward. Just set up an email account and select IMAP as the server type.

IMAP is a mail retrieval protocol with the intention of leaving the mail on the server. In fact, there's no need to ``download'' the mail at all. Most, if not all, operations can be performed directly on the server from searching to moving messages between folders, etc. Most IMAP clients these days will cache downloaded messages, but there's no requirement that they do so; they can access the server every time. I believe OE will cache pretty heavily, though. ISTR it caching too heavily in prior versions and making IMAP not work quite right.

If you want to read the same mailboxes from multiple computers, it's the standard to go with, until something better comes along.