[Today's post comes to us courtesy of Justin Crosby] When Windows 2008 Essential Business Server is installed, your current DNS servers are stored in Active Directory. EBS uses this data to configure the DNS settings on a server during a replacement
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Read the complete post at http://blogs.technet.com/essentialbusinessserver/archive/2008/12/03/decommissioned-dns-servers-appear-during-replacement-mode-install.aspx