Can be done via IMAP Settings below

Settings for IMAP Configuration:

  EMAIL ADDRESS: [email protected] (shared mailbox)

  IMAP SERVER: outlook.office365.com Port 993 with SSL
  SMTP SERVER: smtp.office365.com Port 587 with TLS

  USERNAME: [email protected]\sharedmailboxalias  (user\shared mailbox alias)
  PASSWORD: UserPassword (user’s password)

SMTP LOGIN IS DIFFERENT (!)

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