I am trying to setup a mailbox to extension number 285. There has never been a mailbox assigned to this entension number. We had a expansion unit installed recentally that 285 is on. Whenever I logon as administrator and add a mailbox to extension 285 it will let me add the mailbox number but it will not let me get past the extension number. So I try deleting mailbox 285 and it will say mailbox deleted. But when I try to add it again it was say mailbox assigned and it will not let me get to assigning the service class, directory, etc. Can anyone see what I am missing? It's acting like there is a mailbox assigned to 285 allready. And the company that use to setup our telephone system never kept any records as to what was assigned to a particular extension number.