Exchange Multi Tennant Migration

Hello,

I am facing an issue. We are planning to migrate from "Exchange Hosted Messaging Collabortion"3.5 to Zimbra.

So, moving a single domain with the migration tool works realy realy find. But, we have something like 1260 domains on that platform...

Is there a way to write an xml or something to migrate all these domain in "one shot"?

I have tried with multiple "<ZimbraServer>" to change domain each time in the .xml but no success...

The migration tool create all the users in the first declare domain...

Thanks a lot for any help.