We are looking to cross-forest migrate Exchange mailboxes from one domain to another, but we don't want to retain the old AD account. We will be creating new AD accounts for the users and want to link the existing mailbox to the new AD account.
AD/DC - Windows Server 2003 SP2
Exchange - Windows Server 2008 R2 Datacenter with Exchange Server 2010 SP3
AD/DC- Windows Server 2012 Datacenter
Exchange - Windows Server 2012 Datacenter with Exchange Server 2010 SP3
Is there a cool step-by-step tutorial for this? Should I use ADMT? What are the pitfalls to this desired outcome? We're in the planning phase and just want to see if this option is viable and SIMPLE.