Years ago, we have acquired a Windows 2000 Forest with resources that have already been migrated over to a Windows 2008 AD Domain.
This Windows 2000 Forest has no child domains and only has one domain controller. There are no dependencies such as DNS/DHCP, WINS, Terminal Services Licensing, etc. attached to this DC. All identifiable stakeholders have been notified and have given us their sign-off to retire.
From a business recovery perspective, our team has elected to shut down the server. In the event there are unidentified dependencies, we would power the server back up instead of recovering from backup.
After leaving it shut down for a period of two weeks and there are no outages, we turn over the server to our Intel server support team to retire - wipe disks, unrack.
I understand we should demote a DC if it is the last server of a child domain, but are there any reasons why we should DCPromo in cases like this where the server is the last server of the Forest root domain versus just shutting it down?