Hi all,I'm Facing Problem while I'm Installing Exchange server on the child Domain. Forestprep and is not running on the Child domain, giving an error.

You must run ForestPrep in the root domain in order to extend the schema. That's where the DC is that holds the Schema Operations Master role. You must also run DomainPrep in the root domain for RUS to work properly. Requirements are:* Forest wide permissions to manage Active Directory * Member of the Enterprise Administrators and Schema Administrators groups * Member of the local Administrators group Afterward you should verify that ForestPrep and DomainPrep completed successfully.Forestprep and Domainprep Explained in Detailhttp://www.msexchange.org/tutorials/Forestprep-Domainprep-Explained.html How to Verify That ForestPrep and DomainPrep Completed Successfully in Exchange 2000 Server or Exchange Server 2003http://support.microsoft.com/kb/274737MCTS: Messaging | MCSE: S+M | Small Business Specialist

Besides,please post the setup log here for further troubleshootings.Regards,Xiu