DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP Exchange gateway
allowing users to use any mail/calendar client with an Exchange
server, even from the internet or behind a firewall through Outlook
Web Access. DavMail now includes an LDAP gateway to Exchange global
address book and user personal contacts to allow recipient address
completion in mail compose window and full calendar support with
attendees free/busy display.