No option to send changed meetings to all invites as delegated own

We're running Outlook 2003 on Exchange. I have to set up meetings as a
delegate; I do this by starting in the official organizer's
calendar. The delegate setup stipulates that invites and responses
only go to me. Everything works fine. When one of the items has to be
changed f.i. the time changed, I open this appointment but I can only Accept,
Decline or remove.
There is no option to send the changed meeting to all invites. I also cannot
remove te appoinment onbehalf of the original organizer.