Inter-forest Exchange Migration

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Inter-forest Exchange Migration

So I'm working on migrating Exchange 2003 mailboxes between different forests/organizations. Moved over users with ADMT with SidHistory and that seems to work fine. Went to go use Exchange Migration Wizard to test a few mailbox moves and come to find out that both Exchange servers in both forests just happen to have the exact same netbios server name. So that of course confuses EMW...I tried the IP address and it spins for a minute but says it can't log on.

So is there any way around this or am I resigned to using Exmerge to export/import all the maiboxes?