I'm in the process of finalizing the migration from Exchange 2007 to 2013. At the moment trying to remove an old 2007 UM Server.
With the following command I tried to remove the server from the dial plan:
Set-UMServer -Identity Ex2007UM -DialPlans $null
But the following error is shown:
WARNING: An unexpected error has occurred and debug information is being
generated: Object reference not set to an instance of an object.
Set-UmServer : Object reference not set to an instance of an object.
The same error is shown when using the the Exchange console to remove the server. I've also tried 'Set-UMService' in the Exchange 2013 shell but it just return: You can't change the dial plans of 'EX2007UM' (an Exchange 2007 or Exchange 2010 Unified
Messaging server) using an Exchange 2013 server. You must run the cmdlet on an Exchange 2007 or Exchange 2010 Unified Messaging server.
I made sure the LegacyPromptPublishingPoint in the dial plan is empty and the object states ExchangeVersion: 0.10 (14.0.100.0)
Anything else that I can try?