I'm attempting to remove my first exchange server in a dual exchange server environment and for some reason when I go to remove it, it states that one or more users still use the mailbox store on the server and that it can't uninstall exchange until they are moved to another server or mail disabled. I'm looking in the store and I only see SMTP, system mailbox, and system attendant. Is there anywhere else I should look to verify that nothing is using it? Thanks.