Manually Remove Exchange 2003 from Active Directory

Project is to migrate Windows SBS 2003  to Windows 2012 and Exchange 2013.
1. Migrated AD to Server 2012, Success.
2. Migrated Exchange to 2010, Success.
3. Attempted to un-installed Exchange 2003, failed.
4. Demoted SBS 2003 Server, Success.

I have a Windows 2012 Domain with a functional Exchange 2010 server. I now need to migrate to Exchange 2013 and can not. Exchange 2013 throws an error that Exchange 2003 still exists.

How can I strip out Exchange 2003 from AD so Exchange 2013 will be happy and not damage Exchange 2010 in the process?
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AmitIT ArchitectCommented:
Last option is to use adsiedit to clean up old exchange 2003 server. Follow this
Hypercat (Deb)Commented:
Follow this article:

Mostly, you'll need to do the steps to remove the Exchange server from active directory. You can ignore any other steps that don't pertain to your situation.

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CanOfWormsAuthor Commented:
Thanks for the answer. I was able to use ADSI Edit to remove the Exchange Server 2003 entry. That was all that was needed to allow Exchange 2013 to progress in the installation.
AmitIT ArchitectCommented:

Not sure, what was wrong with my answer. I gave the right answer and you used the same solution, what I told. What is the reason for not giving points to me.
CanOfWormsAuthor Commented:
Your answer was good. But the other answer was more complete and contained a link to an easier to read article. Sorry.
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