Exchange 2007 in multiple Domains one forrest

I have a Windows 2003 domain with an Exchange 2007 running on a Server 2008 setup. It works just fine for the main tree in the domain.

Now I need to add mailboxes for one of the other domains into the Exchange server. There is two-way trust between the forrestes, and I have prepared the domain with setup /preparedomain:contoso.com.

Still I cannot add change scope to the other domain, when I try to add User Mailboxes. It this impossible to do by design? Or am I taking the wrong path?
thomas_egAsked:
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thomas_egAuthor Commented:
I had not set the Modify Recipient Scope to the whole forrest, hence I wasen't able to choose from other domains...
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