2.2.8 [RFC3501] Section 5.2, Mailbox Size and Message Status Updates

V0013:

The specification states that agents other than the server MAY add messages to the mailbox, change the flags of the messages in the mailbox, or even remove messages from the mailbox.

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

Microsoft Exchange Server allows non-IMAP protocols to add messages, change flags of messages, and remove messages.

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