2.2.131 [RFC5546] Section 3.4.3 REPLY
V0285:
The specification describes the use of REPLY with VTODO components.
Microsoft Office Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013, Microsoft Outlook 2016, Microsoft Outlook 2019
Outlook does not export VTODO components. Outlook ignores VTODO components on import. For REPLY-type iCalendar objects, the import fails.