ForestPrep is required prior to installing your first Exchange server. This is the process that adds to required...
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schema extensions and makes changes in the configuration naming container in Active Directory.
Once you ForestPrep your root domain controller, you should then run DomainPrep per child domain. Running DomainPrep in your child domains allow you to utilize your root installation of Exchange Server.
In detail, DomainPrep is required for the Recipient Update Service (RUS), and creates groups and permissions necessary for Microsoft Exchange to work within your child domain.
In your child domains, the following requirements need to be met prior to running DomainPrep:
- ForestPrep needs to have been run in the forest.
- Allow enough time for the schema extensions, as described above, to replicate through the environment.
- The account you are using to run DomainPrep needs to be in the domain admin security group.
MEMBER FEEDBACK TO THIS ASK THE EXPERT Q&A:
Is it possible to add the Exchange server to the child domain and have it reflect the parent domain/root domain email namespace (i.e., firstname.lastname@example.org versus email@example.com)?
You can define the Recipient Update Service (RUS) as you desire. It can generate SMTP namespace for either root.com or child.root.com -- but you need to ensure the appropriate MX record/necessary configuration is complete for inbound email to be routable.
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Peter terSteeg, Deployment and Migration Expert
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