locked
Migrating Cross Forest - Exchange 2010 RRS feed

  • Question

  • In a few months we are planning to do a migration from one Exchange 2010 server to another.
    Both the servers are in different domains.

    I don't know yet if the 2 Exchange servers will have a trust with each other.

    Can someone point me in a direction on how to do this?
    I'm looking for some articles, tutorials, ...
    I have looked around the forums but I can't really find any general guidelines. Just specific problems.

    Thanks in advance.

    Tuesday, October 23, 2012 2:45 PM

Answers

  • To migrate useraccounts, you would need a trust between the two forests.
    If you don't have that, you are still able to migrate exchange data to new user accounts as I wrote in my previous post. Sidhistory is not needed for that, but if you don't have that you will face other problemes (Access to file-and printresources etc etc) but that is outside the scope of Exchange Migration.


    Martina Miskovic

    • Marked as answer by Joachim89 Wednesday, October 24, 2012 12:49 PM
    • Unmarked as answer by Joachim89 Wednesday, October 24, 2012 12:49 PM
    • Marked as answer by Joachim89 Wednesday, October 24, 2012 12:49 PM
    Wednesday, October 24, 2012 8:50 AM

All replies

  • Hi,
    Having a trust is not a requirement when migrating to Exchange 2010 (just so you know).

    Exchange 2010 Cross-Forest Migration Step by Step Guide – Part I
    http://blogs.technet.com/b/meamcs/archive/2011/06/10/exchange-2010-cross-forest-migration-step-by-step-guide-part-i.aspx





    Martina Miskovic

    Tuesday, October 23, 2012 3:05 PM
  • AD trust is required if you are planning to move AD accounts and Sid's etc.

    You can also have a look at.

    Cross Forest Migration Guide – Exchange 2010 to Exchange 2010

    http://gallery.technet.microsoft.com/Cross-Forest-Migration-7443029c

    Cross Forest Migration Guide – Exchange 2003 to Exchange 2010

    http://careexchange.in/cross-forest-migration-guide-exchange-2003-to-exchange-2010/


    Satheshwaran Manoharan | Exchange 2003/2007/2010/2013 | Blog:http://www.careexchange.in | Please mark it as an answer if it really helps you ------------- I do not represent the organisation I work for, all the opinions expressed here are my own. This posting is provided "AS IS" with no warranties or guarantees and confers no rights.

    Tuesday, October 23, 2012 5:38 PM
  • That link doesn't seem to work for me.

    It says: The requested Group cannot be found.

    I'll try to find the article myself.

    Wednesday, October 24, 2012 6:31 AM
  • There's some funny english in that guide. But it's gonna help me a lot. Thank you!

    Wednesday, October 24, 2012 6:32 AM
  • There's some funny english in that guide. But it's gonna help me a lot. Thank you!


    Hmm, I dont know why the link doesn't work, but you seem to have found it so.. :)

    Martina Miskovic

    Wednesday, October 24, 2012 6:37 AM
  • I just found out a trust between the 2 domains probably won't be possible.
    Any chance you have a working link? I'll try to find it myself too.

    Thanks

    Wednesday, October 24, 2012 7:15 AM
  • http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/33b5e25b-07ca-405d-b9fe-a401d2e74f4f

    without Trust -- Cross forest migration

    ============================

    You will lose everything permissions and system wise.

    Export mailbox is just the raw data. You can't use EXMERGE for Public Folders, so those will have to be extracted manually through Outlook.

    Free/Busy information will be published automatically by the clients. However if I was you, I would do exactly what was asked and leave the other side to clean up the mess. There are tons of issues that can come up, but if you have no access or permissions to the other side, then there is nothing you can do to deal with them.

    Simon.


    Simon Butler, Exchange MVP 
    Blog | Exchange Resources | In the UK? Hire Me.

    ===========================


    Satheshwaran Manoharan | Exchange 2003/2007/2010/2013 | Blog:http://www.careexchange.in | Please mark it as an answer if it really helps you ------------- I do not represent the organisation I work for, all the opinions expressed here are my own. This posting is provided "AS IS" with no warranties or guarantees and confers no rights.

    Wednesday, October 24, 2012 7:20 AM
  • Hi,
    Having a trust is not a requirement when migrating to Exchange 2010 (just so you know).

    Exchange 2010 Cross-Forest Migration Step by Step Guide – Part I
    http://blogs.technet.com/b/meamcs/archive/2011/06/10/exchange-2010-cross-forest-migration-step-by-step-guide-part-i.aspx





    Martina Miskovic

    Without trust - I don't think Cross forest migration is possible !!


    Satheshwaran Manoharan | Exchange 2003/2007/2010/2013 | Blog:http://www.careexchange.in | Please mark it as an answer if it really helps you ------------- I do not represent the organisation I work for, all the opinions expressed here are my own. This posting is provided "AS IS" with no warranties or guarantees and confers no rights.


    Wednesday, October 24, 2012 7:22 AM
  • Without trust - I don't think Cross forest migration is possible !!


    Satheshwaran Manoharan | Exchange 2003/2007/2010/2013 | Blog:http://www.careexchange.in | Please mark it as an answer if it really helps you ------------- I do not represent the organisation I work for, all the opinions expressed here are my own. This posting is provided "AS IS" with no warranties or guarantees and confers no rights.


    It sure is!!


    Martina Miskovic


    Wednesday, October 24, 2012 7:24 AM
  • I just found out a trust between the 2 domains probably won't be possible.
    Any chance you have a working link? I'll try to find it myself too.

    Thanks


    Hi,
    When a trust is not possible, a descision must be made on how to create new accounts in Target.

    Exchange can do that for you with prepare-moverequest, but personally I find it better to script that.

    Prepare Mailboxes for Cross-Forest Moves Using the Prepare-MoveRequest.ps1 script in the Shell
    http://technet.microsoft.com/en-us/library/ee861103.aspx


    So to summarize, all that is needed in the Target ORG to be able to migrate mailboxes, is MailUsers (note: mailusers and not mailboxusers).

    Martina Miskovic


    Wednesday, October 24, 2012 7:28 AM
  • I'm sorry this is all very new to me. I'm trying to understand what to do.

    What about the user accounts? How does the migration of user accounts work?

    For example: In the old forest the user accounts are firstname_lastname.
    In the new forest we want them to be lastname_firstletterfirstname.

    How does this work? Do we first create the user accounts in the new forest and then migrate the mail?

    Thanks

    Wednesday, October 24, 2012 8:46 AM
  • To migrate useraccounts, you would need a trust between the two forests.
    If you don't have that, you are still able to migrate exchange data to new user accounts as I wrote in my previous post. Sidhistory is not needed for that, but if you don't have that you will face other problemes (Access to file-and printresources etc etc) but that is outside the scope of Exchange Migration.


    Martina Miskovic

    • Marked as answer by Joachim89 Wednesday, October 24, 2012 12:49 PM
    • Unmarked as answer by Joachim89 Wednesday, October 24, 2012 12:49 PM
    • Marked as answer by Joachim89 Wednesday, October 24, 2012 12:49 PM
    Wednesday, October 24, 2012 8:50 AM
  • Thanks for all the help!
    Wednesday, October 24, 2012 12:49 PM