Exchange 2007 ADprep with multiple domains

Our environment consists of a top-level root domain as a placeholder domain and our production domain underneath.  We just ran setup /prepare schema and /prepareAD last night.  I noticed that new Microsoft Exchange Security Groups OU and security groups were added to the top-level domain and not the domain in which Exchange is currently installed.   Given that the domains are trusting each other, will this present any complications?  I was expecting the new security group OU to be added to our production domain.  Docs I've found indicate this new OU should be created in the forest root domain which would mean we are OK.  The new Exchange 2007 administrative group was added successfully in the ESM.  Please advise.
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44Author Commented:
Found out that Exchange always installs new OUs and groups in the root domain.
If your domain has Exchange 2003 installed you need to run setup /PrepareLegacyExchangePermissions before you run setup /PrepareSchema...

PLP should run automatically if previous versions of exchange is detected but i would try running setup /
44Author Commented:
/preparelegacyexchangepermissions ran successfully.  /prepareschema ran successfully.   /prepareAD is the portion that I'm referring to which creates the Interop admin group and the security group OU.  
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