Hello,
I've found an article on how to recreate the Arbitration Mailboxes here:
https://technet.microsoft.com/en-us/library/mt829264(v=exchg.150).aspx
However, I have a situation where I have a single exchange server, we'll call it "exch2a". It used to be part of a DAG that included "exch1a", but eventually that DAG was severed and we decommissioned exch1a. Problem is, exch2a thinks the arbitration mailboxes are located on the now long-gone exch1a server, as shown below (all commands were run on exch2a):
That first command just queries to find out where any arbitration mailboxes are located, and we see the results say the arbitration mailboxes are located on exch1a on mailbox database081... . When I query that same database 081... name in command 2, I get no results (that database exists on exch2a, but it currently only contains public folders). When I try querying for a specific arbitration mailbox in command 3 (that TechNet article I linked at the beginning gives the five mailbox names so I just picked one), I get no results.
So, my concern is if it's safe for me to go straight to recreating those arbitration mailboxes per the TechNet article, or if I should run some other commands beforehand. Like, should I try to run individual delete commands on each arbitration mailbox name, before doing the steps in the TechNet article?