Posted on 2012-08-14
Last Modified: 2013-07-12
We just recently purchased a new server running Windows Server R2 2008. Our DC is an old server running Windows Server 2003 SP2. Can anyone guide me through how to switch step by step? I'm really new at this so this is going to be a bit chanllenge to implement. Hope someone can assist.
Question by:codba
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    Accepted Solution

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    Expert Comment

    There's a YouTube video on what you'll need to do:

    Step 1:  Run adprep /domain prep on the Windows 2008 server
    Step 2:  Run adprep /forestprep on the Windows 2008 server
    Step 3:  Dcpromo the Windows 2008 server into the Domain
    Step 4:  Transfer FSMO Roles to the 2008 server
    Step 5:  Dcpromo the 2003 server out of the domain

    That's very high level.  There's testing and verification between each phase.  But that should give you a general idea of what needs to be done.
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    Expert Comment

    Just make sure you understand what Replication is, how it works, and don't proceed through the steps until Replication has COMPLETED.  

    Excellent reference from the Microsoft Directory Services Team:
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    Expert Comment

    by:Darius Ghassem
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    Expert Comment

    by:Krzysztof Pytko
    If you wish, you may follow an article on my blog for that at

    after that, please transfer FSMO roles to the new DC

    when you transfer PDC Emulator role, you need to advertise new time server in your forest

    [...]- after transfer of the PDCEmulator role, configure the NEW PDCEmulator to an external timesource and reconfigure the old PDCEmulator to use the domainhierarchie now. Therefore run on the NEW "w32tm /config /manualpeerlist:PEERS /syncfromflags:manual /reliable:yes /update" where PEERS will be filled with the ip address or server( and on the OLD one run "w32tm /config /syncfromflags:domhier /reliable:no /update" and stop/start the time service on the old one. All commands run in an elevated command prompt without the quotes. [...]

    it's an extract from MVP blog at

    when everything works fine, you should consider adding additional DC to have at least 2

    and if you do not need anymore your 2003 DC, you can decommission it

    at the end, you can evaluate if you can raise Domain and Forest Functional Levels


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