c# - Does value of ICalRecurrenceId ever change for each instance of recurring meeting -

i want import meetings number of users database. i'm using ews managed api , c#

when import meetings each mailbox, might encounter same meeting multiple times if each of users have been invited meeting.

for single instance meetings can use value of icaluid unique id of meeting , able store 1 instance of it.

however, recurring meetings not clear additional field should use (along icaluid) identity each instance of recurring meeting series.

can reliably use icalrecurrenceid? value ever change? consistent when meeting instance imported multiple mailboxes? there better field can/should use meet needs?

note - i've looked @ using itemid field returns different value when same meeting returned different mailboxes. need able identity meeting instance regardless of mailbox imported from.

i've not tried using icalrecurrenceid, it's possible icaluid + start (datetime) should allow identify.