2.2.100 [RFC5546] Section 2.1.5 Message Sequencing

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C0021:

The specification describes rules for handling messages that arrive in an unexpected order.

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

This passage describes a calendar user agent action. Microsoft Exchange Server is not a calendar user agent, and does no processing of out-of-order messages.