Add Shared Mailbox to Thunderbird

Procedure

• Open Thunderbird.
• Click the Menu icon > Account Settings.
  • A new tab will open.

• Towards the bottom left, select Account Actions > Add Mail Account....

• If you are prompted to use the Account Hub when adding a Shared Mailbox it will need to be disabled before continuing.
  • Close the Account Hub window
  • Click the  Menu icon >  Settings
  • In the General section, locate the Account Hub and uncheck Create accounts in the new Account Hub.

• Enter the following in the “Set Up Your Existing Email Address” window:
  • Your Full Name: Use the exact name of the shared mailbox
    • Name will be displayed in your Thunderbird folders.
  • Email Address: Email Address of the Shared Mailbox
    • Complete email address with NetID@utdallas.edu
  • Password: Leave blank
  • Remember Password: Uncheck

• Click Configure Manually.

• In the "Manual configuration" enter the following information into the available fields as shown below:
  • INCOMING SERVER
    • Protocol: IMAP 
    • Hostname: outlook.office365.com
    • Port: 993
    • Connection security: SSL/TLS 
    • Authentication: OAuth2 
    • Username: Shared Email Address
  • OUTGOING SERVER
    • Server: smtp.office365.com
    • Port: 587
    • SSL: STARTTLS
    • Authentication: OAuth2 
    • Username: Shared Email Address

• Click Re-test.  When the green message “The following settings were found by probing the given server:” appears at the top of the window the server settings are confirmed.

• Select Done.  Then you will be prompted to sign in with the Shared Mailbox using either Microsoft's or UTD's SSO.

• If prompted with Microsoft's SSO, click Sign-in with another account located below the password text box.
  • Log in with your NetID@utdallas.edu and password.
  • Authenticate with Duo.
  • Select Shared Mailbox’s Inbox and Thunderbird will start to load emails.

• If prompted by UTD SSO, enter an invalid Password and click Sign in.  The window will refresh and you will receive a new login prompt that lets you Sign-in with another account.
  • Log in with your NetID@utdallas.edu and password.
  • Authenticate with Duo.
  • Select Shared Mailbox’s Inbox and Thunderbird will start to load emails.