2.2.27 [RFC3501] Section 6.5, Client Commands ― Experimental/Expansion

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V0047:

The specification describes how to define an experimental command or any command that is not part of the specification.

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 define any such commands.