I am considering using the Zimbra VMWare appliance for a small business. However, I would like to test Zimbra desktop with the end users first. Is it possible to automatically configure Zimbra desktop based on Active Directory Credentials? I would like to initially configure Zimbra Desktop to work with their existing mail solution.

Also, would it be possible to use Zimbra VMWare appliance for things like tasks, contacts (GAL via AD), and calendar, while using a different server for mail in the Zimbra Desktop configuration? If they choose to migrate, I would like to do so gradually in case something breaks, or I find that Zimbra is missing a feature that they must have.