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Error message when you try to remove Exchange Server from a mailbox server that no longer hosts mailboxes: “One or more users currently use a mailbox store on this server”

Error while trying to remove exchange 2003:
The component “Microsoft Exchange Messaging and Collaboration Services” cannot be assigned the action “Remove” because:
-One or more users currently use a mailbox store on this server. These users must be moved to a mailbox store on a different server or be mail disabled before uninstalling this server.

MS article:
To resolve this problem, remove the affected mailbox server entry from the msExchHomeServer attributes in Active Directory. To do this, follow these steps.

Make an export of your Active directory to a .csv file : csvde -m -f c:export-AD.csv
Search in this file for msExchHomeServerName
Test user 1 => msExchHomeServerName = ‘oldserver’
Test user 2 => msExchHomeServerName = ‘oldserver’

msExchHomeServerName :
/o=Organization Exchange/ou=First Administrative Group/cn=Configuration/cn=Servers/cn=OldServer

Should Be :
/o= Organization Exchange/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=NewServer

Start Adsi Edit on your Domain controller:
Go to configuration
Search your user
Right click the user and choose properties
Search for msExchHomeServerName and change it to the correct one
(Try copying it from a other user!)