cross forest Exchange 2010 migratio

We have 2 AD forests, users already have AD accounts in both domains.  Exchange 2010 already exists in domain A and users have mailboxes in this domain.  I'd like to create a new Exchange server in the other forest and move the mailboxes across.  What do I have to do to prepare the already existing user accounts in domain B so that I can move the mailbox over for their use?
cbexpertAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
I just recently Answered a very similar question regrading Cross-Forst migration. See the PAQ I have answered.
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_28643123.html

Will.
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