6.1. When should the SEQUENCE value change?
6.1.1.
The SEQUENCE value should be changed when the date, time, or duration of one or more instances, of the master instance, change. This refers to a scheduling time change, say a meeting that was from 1pm to 2pm is being rescheduled to 3pm to 4pm.
6.1.2.
The SEQUENCE value should not be changed when the only properties that are changed are those not having to do with meeting date, time, or duration change. This refers to changing SUMMARY or LOCATION, for example. When changing these properties, it’s best not to change the SEQUENCE value if a meeting time change is not also involved in the update. The SEQUENCE value is used to denote a date, time, or duration change; not a change in other properties.
6.1.2.1.
Chair sends out a 3 day recurring meeting that repeats Monday through Wednesday. Chair later changes the LOCATION for all the instances, but did not change the date, time, or duration. The receiver will note the SEQUENCE value has not changed, and can simply apply the other properties sent to the recurrence set. If the sender had changed the SEQUENCE value, the receiver could believe this to mean a date, time, or duration change, and attempt to apply a reschedule to the set when one did not occur.