I am sure you guys have seen the following error message before when you try to install DPM on a Windows 2008 server.
A lot of people recently asked me about this error message. You will get this error message if you are trying to install DPM on a Domain Controller. I know the error message is confusing but DPM 2007 is fully supported on a Windows 2008 server. As recommended, do not install applications on Domain Controllers.
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About Santhosh Sivarajan
Santhosh Sivarajan is a Technical Architect in Houston, TX. His main focuses are Microsoft Infrastructure and Security Technologies. He is MCTS, MCSE (W2K3/W2K/NT4), MCP+I, MCSA (W2K3/W2K/MSG) and CCNA certified. His expertise includes Active Directory, Exchange, Migrations, Microsoft Clustering, Microsoft Security, RMS, MOM, LCS, ISA Server, etc. If you wish to send an email, he can be reached at santhosh@sivarajan.com. Blogs: http://santhoshsivarajan.blogspot.com/