Setup has detected that Whistler beta 1 domain controllers were previously installed in this forest. Whister beta 2 domain ...

Setup has detected that Whistler beta 1 domain controllers were previously installed in this forest. Whister beta 2 domain controllers cannot coexist in the same forest as Whistler beta 1 domain controllers.    Demote all Whistler beta 1 domain controllers in this forest before upgrading to Whistler beta 2. An attempt to run both beta versions in a forest may cause loss of data.
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