DavMail POP/IMAP/SMTP/Caldav/Carddav/LDAP Exchange Gateway

DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway
allowing users to use any mail/calendar client (e.g. Thunderbird
with Lightning or Apple iCal) with an Exchange server, even from
the internet or behind a firewall through Outlook Web Access.

WWW: http://davmail.sourceforge.net/