I have one zimbra (7.1.1) install currently running on a server with CentOS 6.
which runs for domain abc.com (just as an example).
and hosts another domain (in Zimbra).

Now I have a new / alternative Server with Ubuntu 10.04 and Zimbra 7.1.2 smoothly running. but with another domain (123.com)

What I'd like to do now is to migrate all user accounts and the data (mail, Calendar, Tasks, ...) to the new server...

is there any easy to follow guide on how to achieve this?

the only thing I found was for Zimbra 5... and the rest reffered to the network edition... (I have the OS edition.)