Exchange 2003 to Exchange 2010 In New Forest

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    Robert R.


    x.tld , a Windows 2003 Active Directory
    ex2003.x.tld , an Exchange 2003 server

    y.tld , a new Windows 2008 Active Directory (functional level Windows 2003)
    ex2010.y.tld , a new Exchange 2010 server

    There is no trust relationship between these two forests.

    We are in the process of creating a new Active Directory, as part of an office move.

    Part of the move will involve upgrading from Exchange 2003 to Exchange 2010.

    What is the best way to migrate mailboxes over?

    FYI: Instead of migrating user accounts, the current plan is to simply create new accounts, although that may be subject to change.

    The best method I could come up with, given the lack of trust relationship, is to simply export each users’ e-mail from Exchange 2003 to a PST file and then re-import it into their new Exchange 2010 mailbox.

    Are there any better ideas? Or anything wrong with this plan?


    Re: Exchange 2003 to Exchange 2010 In New Forest

    That would be a painful and very manual migration. Naturally you have a myriad of options. Are you going to use 3rd party tools such as PriaSoft or Quest? Are you going to use the native Microsoft Tools? What are the technical constraints? IE is coexistence required for the duration of the migration? Directory Sync/ Free Busy/ Public Folders etc.
    This isn’t really a question that can be answered definitively on this board as without knowing your environment it’s too difficult to suggest a path.

    That said going on the information you have provided why have you not considered putting a trust in place? As there is no need whatsoever for manual account creation. (unless its a very small environment) The place holder accounts can be created easily with the prepare-moverequest which will migrate the account(s) attributes bar sid history and group membership. If required that can be done with ADMT.
    Then you can use the new-moverequest to move all mailboxes from source to target. All thats needed is network connectivity a working trust and of course DNS resolution.

    That is of course very high level. Id suggest you get a consultant in. Or do some thorough research as your request is slightly out of the scope in respect of opinions that can be given about the finer specifics of your migration strategy.


    Re: Exchange 2003 to Exchange 2010 In New Forest

    How many users are we talking about?

    Why no trust — can one be established on a temporary basis?

    Robert R.

    Re: Exchange 2003 to Exchange 2010 In New Forest

    I appreciate the responses.

    But for the time being, creating a trust between the two Active Directories is out of the question. Solutions that depend on a trust relationship cannot be implemented.

    That being said, I just got off the phone with an admin from another organization who has one of our former users. While still a manual migration, his solution saves the steps of creating a PST, copying the PST to the new location, and then importing the PST into the new mailbox.

    Have the user open the old mailbox and new mailbox in the same instance of Outlook. This assumes network connectivity to both Exchange servers is available (either directly, via Outlook RPC-HTTPS, or via VPN).

    Then simply move the messages from one mailbox to another within Outlook.


    Re: Exchange 2003 to Exchange 2010 In New Forest

    Without being able to create a trust. You are limiting yourself to only a few options.

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