Hello friends okay?

I currently use Debian 5.9 x32 and Zimbra 7.1.3, there are two domains.

I set up another server Ubuntun 10:04 x64 and Zimbra 7.1.4 and must now pass all the contents of mailboxes, calendar, shared boxes for the new server. What better way to do this for me?

One thing is importate:
My current server there are two domains domain1 and domain2.
In the new server there are other two different domains of the current server,
however usuaris names are the same, changing only the domain.

What can I do with it?