Currently we use a standalone Postfix/Dovecot server for our mail. Calendars are done using SOGo. We also have a domain with OpenLDAP and Samba 3.X. I am trying to find the best way to setup ZCS so that I can test it without replacing anything just yet. Also, once setup will I need to migrate everything to the zimbra openldap or can I leave my existing one and have zcs authenticate off of it? We, being a state agency, are limited on what we can do on our DNS and such so I cannot make any changes there just yet. Thanks in advance.