REST updates for calendars
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
HKCU
software\policies\microsoft\office\16.0\outlook\options\calendar Value name: restupdatesforcalendar
Enabled: restupdatesforcalendar = 1
Disabled: restupdatesforcalendar = 0
Description
This policy determines if Outlook can use REST to update calendars. If you enable this policy, Outlook will use REST to update supported Office 365 and Outlook.com calendars. If you disable this policy, Outlook won't use REST to update any calendars.