We had an employee leave the company so we disabled the account and the computer in AD. Although I have full permissions to all mailboxes, when I tried to add the employees mailbox to outlook, it let me. But then when I tried to expand the mailbox in Outlook it tells me "The set of folders could not be opened".
I thought this had to do with the account being disabled, so I re-enabled both accounts (the computer and the user) in AD. The same thing happens. Why can't I open this users mailbox?