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.
| Registry Hive | HKEY_CURRENT_USER |
| Registry Path | software\policies\microsoft\office\15.0\outlook\options\calendar |
| Value Name | sendmtgasical |
| Value Type | REG_DWORD |
| Enabled Value | 1 |
| Disabled Value | 0 |