2.2.22 [RFC5545] Section 3.2.17, RSVP Expectation

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V0029:

The specification describes the optional RSVP parameter.

Microsoft Office Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013, Microsoft Outlook 2016, Microsoft Outlook 2019  

Outlook only exports the RSVP parameter on the ATTENDEE property. The value of this parameter is "TRUE" or "FALSE".

On import, Outlook ignores the RSVP parameter on any property other than ATTENDEE. Furthermore, all RSVP parameters with values other than "TRUE" (case-insensitive) are ignored.