Rollback plan for DFL & FFL upgrade from Windows server 2003

Marcus Wong Theen Nam 1,111 Reputation points
2022-03-07T18:24:59.703+00:00

I need to upgrade my AD DFL and FFL from Windows server 2003 to 2008R2. As the functional level downgrade is available to server 2008 only. Hence, I would like to know is there any way that I could downgrade it back to 2003 or any recovery plan if there's anything not working with 2008R2 functional level?

I believe a VM snapshot or backup will not work in this case since the AD database is replicated across all the DC. Please correct me if I'm wrong.

Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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Accepted answer
  1. Dave Patrick 426.2K Reputation points MVP
    2022-03-07T18:27:00.863+00:00

    One option may be to take a full backup of the PDC emulator.

    --please don't forget to upvote and Accept as answer if the reply is helpful--


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  1. cthivierge 4,056 Reputation points
    2022-03-07T18:28:30.753+00:00

    The only way to downgrade from a FFL 2008 or 2008 R2 to 2003 is to do an Active Directory Forest Restore
    https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/manage/ad-forest-recovery-guide

    And no, a snapshot will not work.

    1 person found this answer helpful.