Performing an Upgrade on a Single DC Server
After all various considerations regarding applications and hardware compatibility have been thoroughly validated, a standalone server can be upgraded.
The health of the DCs should be verified before upgrading the DCs. In particular, the Domain Controller Diagnostics (DCDIAG) utility should be run and any errors fixed before the upgrade. The Windows Server 2003 DCDIAG utility is part of the Support Tools, which can be found on the installation media under \support\tools\. The Support Tools are installed via an MSI package named SUPTOOLS.MSI in Windows Server 2003. After installing the tools, you can run the DCDIAG utility. The same utility is included in Windows Server 2008 R2 with no additional installs ...
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