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How to tell if it's ready to delete the old Ex2003 server out of ADSIedit.msc?

We already migrated from Exchange 2003 to 2010 for 6 months. The old Exchange03 server has been shut down for months. When I tried to create a new Address List on the Exchage2010, I got an error:

You can't specify the recipient container because legacy servers are detected.

So I got into ADSIedit.msc and found there surely is the old Exchange03 server listed under:
Configuration > Services > Microsoft Exchange > Org > Administrative Group > CN=First Administrative Group > CN=Servers > CN=Exchange03

My question to you is, Can I simply delete the folder   CN=Servers > Exchange03 since my new Exchange2010 server has been running for months without a problem? Do I need to verify anything before I delete it?

If okay to delete, shall I delete the entire folder CN=First Administrative Group  or only CN=Servers > CN=Exchange03 ?
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Castlewood
Asked:
Castlewood
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3 Solutions
 
Todd NelsonSystems EngineerCommented:
Did you go through the process to decommissioning the Exchange 2003 server and then uninstall Exchange 2003 from the server?

In some cases, if the transition from the older server isn't done properly, it won't matter is you remove Exchange 2003 from ADSI Edit.

The address lists, OAB, etc. need to be upgraded too if they haven't already.
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Patrick BogersDatacenter platform engineer LindowsCommented:
Todd is right. You must decommision the old server e.g. move the OAB generator, move any left public spaces, delete routinggroup connections end all.
Then you can uninstall ex2003 from the server.

This link will help you to check what steps you must follow.

Cheers
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CastlewoodAuthor Commented:
Thank you for the reply.
But what if the old Exchange03 server box has been unavailable. What can we do to clean up?
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Todd NelsonSystems EngineerCommented:
If the server isn't available to uninstall Exchange 2003 then you should really do all of the remaining upgrade tasks as stated and outlined in the link Patricksr1972 provided (OAB, public folder replicas, address lists, etc.) and the final task would be to remove the server from AD via ADSI Edit.
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Todd NelsonSystems EngineerCommented:
Sufficient information for resolution.
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