Migrating AD from 2003 to 2008

Posted on 2008-11-05
Last Modified: 2012-05-05
hello all,
i currently have an AD server on 2k3 that also has exchange 2003..i am upgrading to 2 sep 2008 for AD and one for exchange 2k7.  I need to migrate the AD to the 2008 server and the exchange 2003 to the 2k7..can someone tell me how i should go about migrating the AD to the new DC...and should i wait to transfer the AD before migrating the exchange?
Question by:jasonmichel
    LVL 70

    Accepted Solution


    The installation of Windows 2008 into the domain and migration is quite simple.
    First you need to Adprep your 2003 Domain by running
    adprep /forestprep    and
    adprep /domainprep   and
    adprep /gpprep

    from the 2008 DVD on the Windows 2000 DC  - adprep is in the SOURCES folder on the DVD.

    Next install 2008 server on the new machine. You need to assign the 2008 new computer an IP address and subnet mask on the existing network. Make sure that the preferred DNS server on new machine points to the existing DNS Server on the Domain (normally the existing domain controller)

    Join the new 2008 machine to the existing domain as a member server

    From the command line promote the new machine to a domain controller with the DCPROMO command from the command line Select "Additional Domain Controller in an existing Domain"

    Once Active Directory is installed then to make the new machine a global catalog server, go to Administrative Tools, Active Directory Sites and Services, Expand, Sites, Default first site and Servers. Right click on the new server and select properties and tick the"Global Catalog" checkbox. (Global catalog is essential for logon as it needs to be queried to establish Universal Group Membership)

    If necessary install DNS on the new server. Assuming that you were using Active Directory Integrated DNS on the first Domain Controller, DNS will automatically replicate to the new domain controller along with Active Directory. Set up forwarders as detailed at

    You must transfer the FSMO roles to the 2008 machine then the process is as outlined at

    You then need to install DHCP on the new 2008 server (if used) and set up a scope, activate it and authorize the server.

    Change all of the clients (and the new 2008 DC itself), to point to the 2008 DC for their preferred DNS server this may be in DHCP options or the TCP/IP settings.

    You can then transfer any data to the new server

    Before removing the old DC from the domain, run DCPROMO on it to remove Active Directory.

    Netometer has a nice video -

    As for Exchnage then that should   ideally be put on a 2008 MEMBER SERVER, not a DC, and it must go on a 64bit machine, you can then migrate the mailboxes etc to the new exchnage server
    LVL 1

    Author Comment

    wow..thanks for the info...i'll give it a whirl tomorrow and let you know how i do..thanks again

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