http://thr3ads.net/dovecot/2009/07/1089123-vpopmail-and-shared-mailbox
http://wiki.zimbra.com/wiki/Migrating_from_Dovecot_with_External_LDAP
https://wiki.zimbra.com/wiki/ZCS_Mailman_Integration
http://www.zimbra.com/forums/administrators/1380-solved-zimbra-mailman-howto.html
http://www.howtoforge.com/forums/showthread.php?t=27179
http://www.howtoforge.com/installing_zimbra_collaboration_suite_on_ubuntu
http://www.zimbra.com/forums/administrators/44397-email-list-moderation.html