http://imapfs.sourceforge.net/
© 2007 Xuan Luo, xuanluo at ocf dot berkeley dot edu. Note: My project is old and has a lot of unresolved issues and design problems. Please don't try to use it in any production applications. I do not foresee updating it any further. I hope someone will come along and make a better one.
http://sourceforge.net/projects/imapns/
No file, no source
http://scratchpost.dreamhosters.com/software/IMAPFS/
IMAPFS is a FUSE-based filesystem that lets you mount your remote mailbox via IMAP and represent your mail as files.
Experimental (attempted) FUSE filesystem to represent IMAP accounts