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Cross forest mailbox migration from SBS2008 to Exchange 2010 SP1 / Need temporary trust? RRS feed

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    Here's my scenario:

    Customer is a law firm (FirmA.com). They merged with another law firm (FirmB.com) about a year ago. We set them up on SBS2008 middle of last year. There are 30 user accounts with Exchange Mailboxes. Now the two firms have decided to part ways, which will leave 12 people from FirmA on the SBS2008 server and the other 18 from FirmB are moving to a new server running Windows Server 2008 R2 Standard SP1 (Domain controller & DNS) and a virtual machine running same OS and Exchange 2010 SP1.

    The good news is that from the time of the merger, the email accounts were maintained with their original primary email account. So now I just need to migrate just the users from FirmB to Exchange 2010 SP1. I have the new server built but haven't deployed it yet as they're still in the process of finding a new office space for FirmB, so I have a little time where I can run the 2 servers on the same LAN and get this migration done.

    So, here's my question / problem... I've done cross forest migrations before using the steps outlined here (http://msgsense.com/2011/01/18/cross-forest-move-mailbox-request-from-exchange-2003-to-2010/) but since the source server is SBS I can't setup a forest trust relationship between the old and new domains. Is there a way to create a temporary trust for the migration of these accounts and mailboxes?

     

    Wednesday, February 23, 2011 6:34 PM

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