Removing Extra MDB

kuystorj if you have multiple mailbox database copies, you'll remove all the copies first, then you can remove the databases. When you say you want to remove them in the 'safest way possible', what are some of your concerns about removing them? once boxes are moved off, the only remaining data should be disconnected or soft-deleted mailboxes ( get-mailboxstatistics -database "myMDB05 | ?{$_.disconnectreason} ).

Also like the previous user mentioned, you will need to move off any arbitration mailboxes if there are any on them, but Exchange will tell you if there are any arbitration mailboxes on it when you go to delete the DBs (get-mailbox -arbitration | select alias, database)