2.2.94 [RFC5545] Section 3.8.8.3 Request Status
V0208:
The specification describes the REQUEST-STATUS property.
Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, Microsoft Exchange Server 2016, Microsoft Exchange Server 2019
Microsoft Exchange Server does not implement the REQUEST-STATUS property. Microsoft Exchange does not import or export the REQUEST-STATUS property.