Exchange 2007 migration - Question on /PrepareAD switch

I have an empty root domain and 3 child domains. Exchange servers are only installed in the 3 child domains. Do I need to run /prepareAD in the root domain still or should I just run /preparedomain in the child domains?
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I assume you already have the wxcahnge servers installed in your child domain. This means that the /PrepareAd has been already run in the environment. /PrepareDomain can be run on particular domain or you can use /Preparealldomain to run it on all domains.

My question to you would be , why are you looking to run /PrepareAD and for what purpose.

The sequence is as follow for a new exchange setup: (a) /PrepareSchema in domain/site which has schema master to update AD schema with exchange attributes (b) /prepareAD to create exchange security groups (c) /PrepareDomain to set permissions in the AD for the Exchange server object.


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Windows Server 2003

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