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Ics calendar unsubscribe

The whole process is:

User 1 creates an iCal file for a specific date and time and sends it to user 2.

User2 will open the ics file and accept the invitation. An appointment item will be created in User2' s local Outlook.

Now, suppose the appointment is cancelled for some reason, and user 1 must create an ics file and send it to user 2, so that user 2 can cancel his event from his local Outlook.