I send an email with an ICS file for an event that has the UID set to the event Id. Then I update event and send an email with a new ICS file that has the same UID.
Google Calendar updates the already existing event on my calendar due to the same UID. However, Outlook creates a brand new event and leaves the old one there…
How do you make sure an event is updated when opening an ICS in Outlook if one with the same UID exists already on the calendar?