I am looking for a mail/calendar/task/contacts web interface. I think Zimbra is wonderful, but i have an entire company running already an LDAP directory and a running Postfix/Dovecot. My question is about if it could be possible to install only the web interface and configure it to use the existing services, without needing to install the store, ldap, etc provided with the packages (i use debian). The target is the authentication of the users in the LDAP directory, and once authenticated, access the mail server with those credentials. The calendar data, tasks, etc should be stored in some database.
Any help is wellcome. thanks in advance.