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2.2.31 [RFC3501] Section 7.2.1, CAPABILITY Response

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V0052:

The specification states: "A server MAY send capabilities automatically, by using the CAPABILITY response code in the initial PREAUTH or OK responses, and by sending an updated CAPABILITY response code in the tagged OK response as part of a successful authentication."

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 use the CAPABILITY response code to automatically send capabilities to the client. Microsoft Exchange sends capabilities to the client only when the client requests capabilities by using the CAPABILITY command. For more details, see sections 2.2.13, 2.2.14, and 2.2.15 of this document.