on my closed Outlook i change the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\O utlook\Options\Calendar: FirstWOY = 2 (First WeekOfYear -> from value 1 )
(or you can also take an other values like "RemindDefault")

(PS: Outlook itself write the options to this node)

now i'll start my Outlook (16.0.16924.20054 64bit)

but if i check this value in the application options there will NOT be set the correct value.

i found two very interesting points:

with the old Outlook Version 2108 there is no problem with this setting!

AND very scary

with the ProcessMonitor i found the correct ReqQueryValue on the calendar setting but
next entry is a RegSetValue which overwrite my setting!

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