When the requirement to run the adprep /forestprep command was originally introduced in Windows Server 2003, Microsoft and some partners recommended taking the precaution of isolating the Schema Master (e.g., temporarily placing it on a separate network) to better control the schema update process. Since then, Microsoft Customer Service and Support (CSS) has seen this approach cause more problems than it potentially solves for most organizations. As a result, Microsoft no longer recommends taking the Schema Master offline before you run adprep /forestprep.

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