Can I still receive new mail when Zimbra Desktop is not running?
Yes. The graphic user interface of Zimbra Desktop is only the front-end of the software. There’s also the back-end service running behind the scene. The back-end service is responsible for synchronizing data with various remote servers on a user-defined schedule. The Zimbra Desktop service continues running even after you quit the Zimbra Desktop GUI, but at a lower sync frequency when the GUI front end is not running.