This option is only available if the calendar server handles scheduling. Enabling will allow to fall back to the standard email based scheduling instead of leaving it to the server.
Aɣewwaṛ-agi yella kan ma yella aqeddac n uwitay yessefrak aɣawas. Armad ad yeǧǧ ad tuɣaleḍ ar uɣawas s yimayl deg umḍiq n tiǧǧin-is i uqaddac.