Exchange 2003 Exchange 2010 transition servicing multiple domains

Posted on 2011-10-27
Last Modified: 2012-05-12
I have an Exchange 2003 SP2 server running on Windows 2003 which is not a DC.  I have 4 sites, each has its own domain,  all four domains are in the same forest with trust relations setup.  The domains are,,,  The Exchange 2003 server resides at site1 ( and houses mailboxes for the other 3 sites/domains as well.  I have installed Exchange 2010 on Windows 2008 Standard R2 on a new server residing at site1 (  I was able to move all mailboxes for the users to the Exchange 2010 server.  The users are able to access their mailboxes on the Exchange 2010 server without any issues.  When I try to do a local mailbox move on mailboxes who's users reside, I receive a message that says Exchange can't find a domain controller on  I receive the same message when attempting to move mailboxes on the other domains as well.
Please let me know what I need to do to be able to move all the mailboxes to the Exchange 2010 server.
Question by:mseals
    LVL 14

    Expert Comment

    How are you moving mailboxes? I'm sure you have to use -remotelegacy

    Have a look at this

    Also have you started the MRS service? Do all your exchange 2003 servers and domain controllers have service pack 2?

    Author Comment

    I only have one AD forest.  What is MRS service?  The only Exchange 2003 Server has SP2 and all Domain Controllers are SP2.
    LVL 14

    Accepted Solution

    See I have done a few cross forest moves and followed the guidelines in this blog

    You still need to copy AD accounts between domains (intra forests, this is actually a move), you can use ADMT for that (or FIM), you still need to prepare those MEU with the Exchange attributes that ADMT is incable of transfering using the script preparemoverequest.ps1 once these two steps are done you should be able to move your mailboxes between domains.

    If you dont want to use ADMT to copy accounts, you can use the preparemoverequest script to creat a MEU for you however this is a new security principle with no sid history and you would lose all your mailbox delegation once the mailbox is moved.

    Have a read of the blog and try some of the suggesitons.

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