Merge 2 Exchange Servers from 2 Domains within same Forest.

Posted on 2009-02-18
Last Modified: 2012-05-06
I am a network admin for Domain A, which is the forest root. We have aquired another company and added them to our forest as another domain tree, Domain B. We are a Server 2003 organization, using Exchange Server 2003. We are also connected via 1.5mbps MPLS. We have a Mail Server here, and also one at the remote site. All traffic, for both domains come through a pair of Cisco ASA 5510. I want to move all the mailboxes from Domain B to the Mail server located at Domain A and decomission the Mail server at Domain B. What is the best way to do the mailbox migration, and what issues do I need to be aware of as we move forward?
Question by:tlowe2
    LVL 35

    Expert Comment

    by:Jian An Lim
    you should try this

    i personally havent done it before but you need to build a trust on both sites. and then move the user from one to another. then move the mailbox.


    Author Comment

    Since Domain A is the Forest Root, and Domain B is a domain within that Forest isn't there a Trust established by default. We added Domain B to our AD Forest, not as a child domain but as another domain tree.
    LVL 35

    Expert Comment

    by:Jian An Lim
    as long as there is trust, that should be fine.

    Author Comment

    Right, I know it is possible to accomplish the task, I am just unsure of the exact steps involved in correctly copying all the mailboxes/databases over to the server on Domain A, and connecting the mail clients on Domain B to the "new" Mail server. Thank you for your time, and i apologize if I am unclear.
    LVL 35

    Accepted Solution

    as it says

    1. Migrate NT accounts with ADMT, this will preserve the SID History.
    2. Use the Exchange Migration Wizard the /m (Clone) option.  The Clone option will preserve the entire mailbox and will preserve rules.  In addition ACL access will contiune to work through the SID history.  Also rules based on e-mail addresses will contiune to work since the Migration wizard will also preserve the old Exchange address in the move.

    The Migration Wizard provides the option to exclude imported messages based on key words in the subject lines of those messages. To use this feature, you must create a subject line exclusion file, saved as a Unicode text file, to use with the Migration Wizard.
    " If you perform more than one migration to the same target mailbox, duplicate messages may be created in that mailbox.
    " The Migration Wizard does not change or reconfigure the source mailbox or account. The source mailbox continues to receive mail after you perform a migration. You can configure other recipients to point to the new mailboxes, or remove the original source mailboxes and replicate contacts by using an inter-organizational ADC.
    " When you use the Migration Wizard to migrate mailboxes, single instance storage is lost for the migrated data in the target information store. Make sure that enough hard disk space is available to handle the increased storage requirements that this may cause.

    the wizard can be found here;en-us;328871

    If you run into problem, we can help by then. Or else this will be an open ended question


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    Thank you for your time and patience.

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