How to access a Shared Mailbox using Thunderbird or other IMAP client

Exchange Configuration

USER EMAIL: [email protected]   
PASSWORD: password
SHARED MAILBOX: [email protected]      (could also be, of course)   
SHARED MAILBOX ALIAS: shared-mailbox

Note: Please make sure to create the UNIQUE alias always with the mailbox, because it creates the user [alias] In this case [email protected]

Settings for IMAP Configuration

EMAIL ADDRESS: [email protected] (shared mailbox)
USERNAME: [email protected]\shared-mailbox  (user\shared mailbox alias)   
PASSWORD: password (user's password)

SMTP Login Is Different

USERNAME: [email protected]  (users email)   
PASSWORD: password (user's password)

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