Declining recurrend appointments with no end date

[geist]

Hi forum,

we are facing massive problems synchronizing Outlook 2016 with Kopano. As Kopano support is not able to help, we are trying several work arrounds. One trial is avoiding infinite appointments.
In Outlook it can be declined by registry key.

How do I suppress the option “No end date” in the “Appointment Recurrence” dialog?

Thanks in advance :-)

Best regards
geist