When a particular user sends out a meeting request and invited attendees respond by accepting the request, the invited attendees receive a message from System Admin stating that "The e-mail account does not exist at the organization this message was sent to." The email account is one that has been deleted from AD and purged from exchange. The email account used to be the meeting requesters secretary that has left. Somehow the users outlook is configured to send to this account as well. Since the AD account has been deleted it rightfully sends the system admin message. I cannot find in the users Outlook where it may be configured to send to this deleted account. It is not in delegates and it also happens via OWA as well. Sounds like a simple issue to resolve however I cannot seem to find where this configuration was made.