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You either need to move the schema master or run the prep from the command line on the schema master itself. <br />
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<a href="http://technet.microsoft.com/en-us/library/bb125224(v=exchg.141).aspx" rel="ugc">http://technet.microsoft.com/en-us/library/bb125224(v=exchg.141).aspx</a><br />
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Once you have run prep on the schema master, wait for replication, then try again. <br />
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Simon.
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I need to know what is the ramification of moving the Schema Master from the Root Domain to the Child Domain?
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I am receiving an error when upgrading to SP3. Seems its not able to contact the Schema Master since the Exchange server is on the Child Domain and the Schema Master account is on Root Domain and stating to run setup with the /prepareAD parameter which i have never done.<br />
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Here's the error:<br />
Setup needs to contact the Active Directory schema master but this computer is not in the same Active Directory site as the schema master.<br />
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Setup needs to contact the Active Directory schema master but this computer is not in the same Active Directory domain as the schema master.<br />
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Setup encountered a problem while validating the stat of Active Directory Exchange organization-level objects have not been created, and setup cannot create them because the local computer is not in the same domain and site as the schema master. Run setup with the /prepareAD parameter on a computer in the domain and site, and wait for replication to complete.
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I am receiving an error when upgrading to SP3. Seems its not able to contact the Schema Master since the Exchange server is on the Child Domain and the Schema Master account is on Root Domain and stating to run setup with the /prepareAD parameter which i have never done.

Here's the error:
Setup needs to contact the Active Directory schema master but this computer is not in the same Active Directory site as the schema master.

Setup needs to contact the Active Directory schema master but this computer is not in the same Active Directory domain as the schema master.

Setup encountered a problem while validating the stat of Active Directory Exchange organization-level objects have not been created, and setup cannot create them because the local computer is not in the same domain and site as the schema master. Run setup with the /prepareAD parameter on a computer in the domain and site, and wait for replication to complete.

Exchange 2010 SP3 install error

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.