TechNet topic about how to upgrade domain controllers to Windows Server 2008 R2

We have published a topic that explains how to upgrade domain controllers to Windows Server 2008 and Windows Server 2008 R2. This topic is based on customer experiences that have been resolved by Microsoft Customer Support. It covers how to prepare for deploying the domain controllers, application compatibility and other known issues, hotfixes to install before and/or after the domain controllers are deployed, steps for running Adprep.exe, and troubleshooting information for Adprep and Dcpromo. It also has references for running virtualized domain controllers and configuring Windows Time Service for DCs. The topic is intended to be a comprehensive, one-stop location to cover any issues you might encounter when you add new domain controllers to an existing domain or upgrade domain controllers that you already have deployed. So let us know about other issues you want to see covered. The topic is:

Upgrading Domain Controllers to Windows Server 2008 R2 (

Your feedback is appreciated.

Justin [MSFT]

Active Directory Documentation Team

This posting is provided "AS IS" with no warranties, and confers no rights.

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