2.2.145 [RFC5546] Section 5.2.2 Unexpected Reply from an Unknown Delegate

V0278:

The specification states that when an attendee delegates an item to another calendar user, they MUST send a REPLY method to the organizer using the ATTENDEE ([MS-OXCICAL] section 2.1.3.1.1.20.2) properties to indicate that the request was delegated and to whom.

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 export DELEGATED-TO or DELEGATED-FROM. Microsoft Exchange ignores DELEGATED-TO and DELEGATED-FROM parameters on import.