exch 2007 mail migration

I have domain X running exch 2007.
I have domain Y running exch 2007 server.  Separate forests.
Im migrating domain X to Domain Y. All the users in domain X, already have new account and mailbox created in domain Y. We did not run ADMT for this process so no SID history is available.  Is there a way to move domain X mailboxes to Domain Y and merge the contents of domain X mailboxes to the users new mailbox in Domain Y ?  The naming schemes are different as well (domain X,  fistinitallastname, domain Y  firstname.lastname).
All the mailboxes on domain Y are empty. They are just forwarding mail.
What options are available to accomplish the moving/merging of mailboxes from domain x to domain Y in this scenario?
Thxs
KratosDefenseAsked:
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Move mailboxes across forests:
http://technet.microsoft.com/en-us/library/aa997145.aspx 

Or you can do export-mailbox / import-mailbox, but I would do the across forest move.


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KratosDefenseAuthor Commented:
This article claims: Move the user account to the target forest by using ADMT v3.  We are not using ADMT to migrate the SID history. Is there a way we can move domain x users mailboxes to their new mailbox in domain y and have the 2 boxes merge?

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