Send Internet meeting requests using iCalendar format
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
HKCU
software\policies\microsoft\office\16.0\outlook\options\calendar Value name: sendmtgasical
Enabled: sendmtgasical = 1
Disabled: sendmtgasical = 0
Description
This policy setting determines whether users' meeting requests sent outside of your organization use the iCalendar format. If you enable or do not configure this policy setting, meeting requests sent outside of your organization use the ICAL format. If you disable this policy setting, meeting requests sent outside your organization use the TNEF format.