I am in the process of decommissioning an Exchange 2013 server and just need to disable one more arbitration mailbox but getting error in attachment
Harlan,
I pinged you on the chat so I can have a look? Can we connect?
What happened is that one Arbitration mailbox did not have a valid AD Object. Trying to disable that mailbox does not work. Easiest way is to go into ADUC and remove all Exchange related accounts. Do not do this if you migrated to a new version of Exchange or if you have a Hybrid config with Office 365