This was posted in the Zimbra Desktop forum, I'll move it to the correct one.
You've really given us no information about the problem, you can start by updating your
forum profile with the output of the following command (do not post the information in this thread):
When you've done that you need to look in the
log files and see what the exact error is when you start Zimbra. Search the forums for the errors and try some of the solutions that you'll find.