An Adprep Caveat

When the requirement to run the adprep /forestprep command was originally introduced in Windows Server 2003, Microsoft and some partners recommendedtaking 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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