I am trying to coordinate a process schedule involving many dates and many
individuals.  Creating and sending individual date specific appointments
would be impractical.  Ideally I would like to generate a CSV file with the
necessary dates and reminders for recipients to import into their own
calendars, without me having to serve as a meeting organizer.  However, I
need to be able to send out revised CSV files when the schedule changes.  
From what I can tell, importing appontments with revised times would NOT
remove the old appointment and original time.  I need to do that, and cannot
require recipients to manually remove them.  Do I have any options?  Is it
possible to create an importable CSV that shows the new time AND eliminates
the old time?  Or, is it possible to import an ANTI-appointment that negates
an appointment already on someone's calendar?