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Exchange 2007 SP2 /SCHEMA EXTENSION

I am trying to Install SP2 on my exchange server running 2003 sp2 domain controllers and my installation stops with the following error

After following the link it is telling me to run setup /PrepareLegacyExchangePermissions I get the following

Hello I am trying to Install SP2 on my exchange server running 2003 sp2 domain controllers and my installation stops with the following error. So I do know what system components I need. Can some one please assist?
see attachment pls max point awarded
experts-exchange-help.docx

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Glen Knight

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itnetworks

ASKER

I found the solution to my problem by running DCDIAG, TY

Glen Knight

What was the cause?

Would be useful to know for future reference.

itnetworks

ASKER

My Domain controllers where not on the correct Domain OU, when the install was trying to verify against that OU it was empty hence the error of cannot find the DC OU, by default Windows Server 2003 stores the computer account for all domain controllers in the Domain Controllers organizational unit (OU) to which the Group Policy Object named Default Domain Controllers Policy is linked, my DC's where all located in an OU called servers that we created and where all the servers are stored in. thanks for your help running the DIAG on my DC guided me to this error.