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Exchange 2013 CU2 upgrade AD error

In my development environment, which is an exact replica of production, I am testing the upgrade for Exchange 2013 to CU2. When running the install all the prereq checks pass just fine, however once it begins to actually install I get the following error:

Error:
The following error was generated when "$error.Clear();
      install-AdministrativeGroup -DomainController $RoleDomainController

" was run: "Active Directory operation failed on "domain controller". The object 'CN=Folder Hierarchies,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN="domain",CN=Microsoft Exchange,CN=Services,CN=Configuration,DC="domain",DC=com' already exists.".

My thinking on this is, well of course it already exists, as this is simply an upgrade of the current Exchange 2013 CU1 (Version 15, Build 620.29). However this causes the installation to fail.

I have attempted to manually do the ADSCHEMA and ADPREP upgrades before running the software upgrade and both run with out error, however the software upgrade still fails.

Google hasn't found much on this particular error so I am wondering if anyone has any thoughts.

Thanks in advance!
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bbellas
Asked:
bbellas
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1 Solution
 
Nick RhodeIT DirectorCommented:
Seems this error is common and I am not sure of possible cause.  Some people have issues and some don't with the upgrade.  From what I have seen so far an escalated call to Microsoft is what has been done in my experience.
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bbellasAuthor Commented:
So I did end up calling Microsoft support, and unfortunately got charged for a support case, and the next day received a reply to my post on TechNet with the link to the exact article I needed with the fix.

Here is the link to the fix for this issue:
http://blogs.technet.com/b/manjubn/archive/2013/09/02/1-exchange-server-2013-preparead-or-cumultive-update-installation-fails.aspx

This error occurs when the "CN=Public Folders" container underneath "CN=Folder Hierarchies" has been deleted from Active Directory. Use the ADSI Edit to determine whether the Public Folders container exists.

If the "CN=Public Folders" container has been deleted, I recommend you manually recreate Public Folders container in the Folder Hierarchy and set the msExchPFTreeType value to 1 to check the result.
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bbellasAuthor Commented:
I received the solution from both Microsoft tech support and a reply to my TechNet forum post.
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