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Procedure
- Open Thunderbird.
- Click the Menu icon > Account Settings.
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- Towards the bottom left, select Account Actions > Add Mail Account....
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- 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
Note: Leave the Password and Remember Password fields blank.
- 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: Normal Password
- Username: Shared Email Address
- OUTGOING SERVER
- Server: smtp.office365.com
- Port: 587
- SSL: STARTTLS
- Authentication: Normal Password
- Username: Shared Email Address
- Click Re-test.

- Server settings are confirmed when the green message “The following settings were found by probing the given server:” appears at the top of the window.

- Select Done.
- If it asks you to sign into the Shared Mailbox with a Password, click Cancel.
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- Go to Account Settings > Mailbox Column > Shared Mailbox > Server Settings.
Note: Mailbox column is referring to the column of added email mailboxes.
- Change “Authentication Method:” to OAuth2.

- Click on Mailbox Column > Outgoing Server (SMPT).
- Select the Shared Mailbox from list and click Edit....
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- Change “Authentication Method:” to OAuth2 and set “Connection Security:” to STARTTLS.
- Click OK to save.
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- Restart Thunderbird.
- You will be asked to sign in with the Shared Mailbox’s UTD Password.
- When prompted to sign in, click Sign-in with another account located below the password text box.
Note: It is very important to click sign-in with another account or mailbox will not load.
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- Log in with your NetID@utdallas.edu and password.
- Authenticate with Duo.
- Select Shared Mailbox’s Inbox and Thunderbird will start to load emails.