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Applies To: Windows 7
The Active Directory Installation Wizard (Dcpromo.exe) in Windows Server® 2008 R2 now prevents the creation of new Active Directory domains using single-label names, however existing single-label domains can still be upgraded to Windows Server 2008 R2.
For more information, see Information about configuring Windows for domains with single-label DNS names in the Microsoft Knowledge Base (https://go.microsoft.com/fwlink/?LinkID=106631).