I'm currently in the process of evaluating Zimbra on a small scale. Currently I have about 10 users on Zimbra which I have manually transitioned from Exchange 5.5. Overall I have about 900 users with 14 different domains; from what I have read migrating their existing accounts from Exchange should be no problem.
What I haven't found documentation on is Active directory importing. Currently when a user is added or removed from payroll a script runs that adds/removes them from Active Directory and Exchange. Is there a way I can make this happen with Zimbra? People are hired/fired/quit all the time; it would be very difficult to keep up with the users...
Any help is appreciated!