Hi,
There's no way to disable it but I've found a workarround. You can specify "MaximumDurationInMinutes" to decline all meetings longer than specified time (1380 mins max).
To do that execute this on EMS:
Set-MailboxCalendarSettings CalendarNameHere
m1 -AutomateProcessing:AutoAccept -MaximumDurationInMinutes 1380
Posted as a reply to:
How can I disable the "all day event" option in Outlook calendar?
I have setup meeting rooms as resources in Outlook. I want to prevent people
from booking "all day events". Is there a way to disable this feature/option?
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