2.2.3 [RFC3501] Section 2.3.1.1, Unique Identifier (UID) Message Attribute

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V0004:

The specification states that the unique identifier of a message SHOULD NOT change between sessions.

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

Microsoft Exchange Server assigns a new UID to a revised message. (A message can be changed by another protocol and, under certain conditions, the revised message replaces the existing message.)