2.2.27 [RFC3501] Section 6.3.8, LIST Command

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V0041:

The specification states that server implementations are permitted to hide otherwise accessible mailboxes from the wildcard characters.

Microsoft Office Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013, Microsoft Outlook 2016, Microsoft Outlook 2019

When Outlook is in "show all folders" mode, Outlook requires that the server expose the hidden folders for wildcards, thereby making the full hierarchy discoverable.

V0042:

The specification states: "The special name INBOX is included in the output from LIST, if INBOX is supported by this server for this user and if the uppercase string 'INBOX' matches the interpreted reference and mailbox name arguments with wildcards. The criteria for omitting INBOX is whether SELECT INBOX will return failure."

Office Outlook 2007, Outlook 2010, Outlook 2013, Outlook 2016, Outlook 2019

Outlook interoperates properly with a server that does not expose INBOX.