I have a reoccuring meeting that was set up three years ago by a terminated employee. The AD and Exchange accounts have been deleted for a couple of years. I recently upgraded to Exchange 2007 and all clients are on Outlook 2007. When trying to delete this meeting and send the cancellation notice I receive the errror: "You do not have the permssion to send the message on behalf of the specified user". How can I delete this meeting when the account is no longer present?