Update Appointment using iCalendar PUBLISH Method

[Rob Miller]

We have an which is going to send iCalendar attachments to users to
add appointments to their Outlook calendar.

I would like to use the PUBLISH method because it creates an
appointment instead of something like a meeting request. The REQUEST
method seems to create a meeting request, not a simple appointment.

The main issue I am having is that you cannot update an appointment
using the PUBLISH method. The UID's are the same, the SEQUENCE gets
incremented, but the appointment does not get updated. Instead, a new
appointment is added to the user's calendar.

I can update appointments using the REQUEST method, but I'd rather use
PUBLISH. The iCalendar specification says that you can update
appointments using the PUBLISH method. It appears that Outlook does
not support this, however.

Does anyone know if Outlook supports updating appointments using the
PUBLISH method?

Thanks,

Rob