The previous exchange admin previously tried to install Exchange 2016 in a (2) DAG Exchange 2010 environment and caused some serious issues. I went ahead and cleaned it up when I was tasked with the role but after decommissioning the Exchange 2016 server I am seeing a lot of health monitoring mailboxes and system mailboxes in our AD under CN=Microsoft Exchange System Objects.
I want to know what is the best way to remove these identities to clean things up but without causing any issues? Let me know if further detail needs to be provided.
I am trying to clean these up before I go into upgrading our Exchange environment to 2016.