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Installing a 2008 DC in a 2008R2 prepared forest/domain

    Question

  • Hi

    I have a 2003 functional level active directory forest and domain. I have prepared and installed a couple of 2008-R2 domain controllers but we are still running at 2003 functional level.

    Can I install a 2008 (NOT R2) domain controller into the domain? do I have to run forest/domain prep?

    the reason I am wary is that I went straight from Exchange 2003 to Exchange 2010. then I installed Exchange 2007 which broke Exchange 2010. I wondered if the same thing would happen with Domain controllers.

    thanks for any info.

    Monday, June 09, 2014 9:57 AM

Answers

  • oh, I am sorry. I didn't read your post carefully.

    When you added Windows Server 2008 R2, you already extended schema to version 47.

    just FYI, when you are adding Windows Server 2008, you extend schema version to 41, which is lower than 47, obviously.

    So, in your case, if you want to add Windows Server 2008 and promote it as a DC, you don't have to run forest/domain prep, as you already extended schema for Windows Server 2008 during the Windows Server 2008 R2 promotion.

    Also, if you try to join Windows Server 2008 to the domain, and it gives you an error, that you have to run forest/domain prep, than I am wrong and I guess that you should run ADPREP.exe :)

    If you want to check what schema version you have right now, check this link: http://www.itgeared.com/articles/1012-how-to-validate-your-current-active/

    • Marked as answer by globrien Tuesday, June 10, 2014 9:46 AM
    Tuesday, June 10, 2014 9:42 AM

All replies

  • Hi,

    Based on my experience, with Windows server 2003 domain function level, you can have domain controllers with Windows server 2003, Windows server 2008, Windows server 2008 R2, Windows server 2012 and Windows server 20012 R2.

    For more detailed information, please refer to the link below:
    http://technet.microsoft.com/en-us/library/understanding-active-directory-functional-levels(v=ws.10).aspx

    Best regards,

    Susie


    Tuesday, June 10, 2014 8:17 AM
  • You can join any version of DC as long as it is the same or above the domain functional level version.

    In your case, this means you can add 2003, 2008, 2008 R2, 2012, 2012 R2.Later on, you can raise a domain and forest functional level, but you wont be able to join any 2003 DCs to the domain anymore.

    Tuesday, June 10, 2014 8:22 AM
  • Thanks for your replies.

    I understand that I can run the various editions in my 2003 forest, I guess my question is...

    If I have run forest & domain for 2008R2 do I have to run Forest/Domain prep for 2008, and will that break 2008R2

    Tuesday, June 10, 2014 8:32 AM
  • oh, I am sorry. I didn't read your post carefully.

    When you added Windows Server 2008 R2, you already extended schema to version 47.

    just FYI, when you are adding Windows Server 2008, you extend schema version to 41, which is lower than 47, obviously.

    So, in your case, if you want to add Windows Server 2008 and promote it as a DC, you don't have to run forest/domain prep, as you already extended schema for Windows Server 2008 during the Windows Server 2008 R2 promotion.

    Also, if you try to join Windows Server 2008 to the domain, and it gives you an error, that you have to run forest/domain prep, than I am wrong and I guess that you should run ADPREP.exe :)

    If you want to check what schema version you have right now, check this link: http://www.itgeared.com/articles/1012-how-to-validate-your-current-active/

    • Marked as answer by globrien Tuesday, June 10, 2014 9:46 AM
    Tuesday, June 10, 2014 9:42 AM
  • Got it - thank you!
    Tuesday, June 10, 2014 9:45 AM