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iCalendar Recurrence Problems and Recommendations
3. Recommendations for iTIP
3.1. Recurrence properties modifications
3.1.1.Clause3.1.1To reschedule an event to a set of explicit dates/times but not replace the set with a new rule pattern, the sender should send a set of components with RECURRENCE-ID being set in each to handle the explicit override of the rule’s date/time.
3.1.2.Clause3.1.2If an RRULE is changed, then the entire iCalendar object should be resent in the reschedule. This tells the receiver that all exceptions should be removed and replaced with this new rule. The new RRULE