Cancel a meeting in outlook
 

I cancel appointment meeting with this instruction:
myAppt.MeetingStatus = OlMeetingStatus.olMeetingCanceled;
myAppt.Send()
myAppt.olMeeting.Delete()

How do I cancel an appointment in outlook such that is sends the
cancel notice too the meeting attendees.
appointmentItem.Delete does
delete it but does not notify other attendees, and with Send I have the
next problem:

When I do this manually Outlook sends and email with "Cancelled: subj" ;
with
my program it sends and email with "Updated: subj".

Please, Help me!!!

Very Thanks