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How do I remove a demoted DC from my Exchange 2007 Configuration?

 I have used metadata cleanup to remove the DC from AD but when I run EXBPA I still see the demoted domain controller as part of my first storage group.  I think it is causing problems with my Free/Busy data because I keep seeing error 8207 in my Event View (0x80040115) Error updating public folder with free/busy information on virtual machine EXCHANGE.  How can I correct this?

Here is a picture:
EXBPA Screen Shot
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Did you try dismounting and remounting the Public Folders?
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I had not yet, I just tried and I have the same result.  Is there anything I need to do to the Public Folder Database while it is dismounted?
Check the Public Folder list using the Exchange Server 2007 Console:
Get-PublicFolder -server exchsvr "\non_ipm_subtree\SCHEDULE+ FREE BUSY" -recurse | Format-List
For more info refer to

If no replicas are found run the recommended command from the link above.  There was a hyphen missing so see the correct command below:

Set-PublicFolder -Identity "\NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY\EX:/o=company/ou=First Administrative Group" Replicas "server\Public Folder Database"

Set-PublicFolder -Identity "\NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY\EX:/o=company/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)" -Replicas "server\Public Folder Database"

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Are you able to see the DC in AD, if yes then you have to remove it using metadata.
This will automatically remove from exchange when dsaccess will gather the DC and GC.
See for removing the DC manually.
Although, I don't believe the error messages are soley related to the DC still showing up in AD.
I noticed this also when moving a mailbox.  There seems to be two First Storage Groups.  Nothing shows in AD.

Old Mailbox Store showing in ESM
So you forgot to uninstall and remove Exchange from the server first and demoted the machine without doing this, correct?  What version of server are we talking about anyway?  
Took me a second, but yes you are correct.  The current one is Server 2003x64 Standard the previous one was Server 2003 Standard.
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Ok thank you.  When I get to CN=Your_Administrative_Group I have two, one appears to be old Exchange 5.5 site name.  The old one only has the demoted server in the Servers container.  I wonder if it would be ok to delete the whole "first administration group".

I did delete CN=first administrative group and nothing has blown up yet.
The only things that you might encounter "blowing up" are the public folders.  Clients might still look for the old server.  You might have to run ASDIEDIT on a desktop computer.
**NOTE** Point ADSI EDIT to your new server, as in you have to right click on it and choose "Connect to".

Expand each of the following items:
Configuration Container
CN=Configuration, DC=Domain_Name,DC=com
CN=Microsoft Exchange