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2.2.4 [RFC3501] Section 2.3.2, Flags Message Attribute

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E0001:

The specification states that the server can define keywords. (A keyword is a non-system flag.)

Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, Microsoft Exchange Server 2016, Microsoft Exchange Server 2019

Microsoft Exchange Server defines the $MDNSent keyword, which is set on the message when the client sends a message delivery notification (MDN).

V0005:

The specification states: "Servers MAY permit the client to define new keywords in the mailbox."

Exchange 2007, Exchange 2010, Exchange 2013, Exchange 2016, Exchange 2019

Microsoft Exchange does not support client-defined keywords.