IMAP in mutt should be considered beta quality. For the most part itworks well, but it is still not quite as stable or as full-featuredas some of the other drivers. I believe it is now acceptable fordaily use (and that's how I use it now, currently against Cyrus 1.6.24 andpreviously against UW-IMAP 4.7 and 2000).
You may still lose some work if you are suddenly disconnected from yourserver (but your mailboxes should be fine). Currently accessing the sameIMAP folder with multiple clients is not supported - it may work, butno guarantees. There are still several non-critical known bugs, seehttp://bugs.guug.de/ for the current list.You may also be disappointed in mutt's handling of very large IMAP mailboxes.To build the message index mutt must fetch a subset of headers from everymessage in the mailbox, which costs time and network traffic linear to thenumber of messages in your mailbox.Nevertheless in general mutt is quite a fast and fully-featured IMAP client.It tries to be polite to IMAP servers as well, opening few connections andavoiding needless polls of the server, unlike certain other popular IMAPclients by certain large corporations :)Mutt supports almost all official authentication and security protocols forIMAP, including SSL/TLS, native CRAM-MD5 and GSSAPI routines, and a SASLplugin which can handle just about everything else.