Copy mailboxes from old domain to new domain

[razametal]

Hi,

I have a new install of zimbra 5.0.9 and a backup of the older zimbra server on a folder. I need to restore the email messages of all the users at the old folder to the new zimbra instalation. I've the users created again with a new domin.

How can I copy the messages of all the users from /opt/zimbra-old to the new instalation?

Any help will be very appreciated,