From the calendar reminder, if you click on "delete" it opens the event series and not the event occurence (single event).
So if if we do not pay attention, we delete all the events !!!
And we lost all because the deleting event is definitively deleting (not present on the deleting items).
The problem is only for the Outlook local software. On the web software (or Windows local software) the logic is good : it opens only one event.
So how all sofware doesn't works the same ???