Thunderbird is not the most suitable email program for Exchange. We do recommend using Microsoft Outlook.
Go to Tools - Account Settings - Account Actions - Add Mail Account.
Enter the following in the screen that follows :
Your name: Use exact name of the shared mailbox (e.g. Firstname: Shared Lastname: Account)
Email address: email address of the shared mailbox (e.g. shared@uwaterloo.ca). Use the 8 character username of the shared account and @uwaterloo.ca)
Password: Leave PASSWORD field blank
uncheck ‘Remember Password’
Click Configure Manually.
In the Set Up Your Existing Email Address window, enter or select the following settings in the Incoming and Outgoing columns as shown, then click Re-set.
Incoming
Protocol: IMAP
Server: outlook.office365.com
Port: 143
SSL: STARTTLS
Authentication: password for shared account
Username: Use 8 character username for Shared Account the shared account (e.g. sharedmb@uwaterloo.ca)
Outgoing
Protocol: SMTP
Server: outlook.office365.com
Port : 587
SSL: STARTTLS
Authentication: password for shared account
Username: Use 8 character username for Shared Account shared account (e.g. sharedmb@uwaterloo.ca)
4.
Outgoing: SMTP
Now click Re-Test. This will check the server and add the OAUTH2 option under Authentication. Change the Normal Password entry to be OAUTH2. (Note that some of the settings change as a result of the last step.)
5. Your settings will now look as below:
6. Click DONE Done
This will create the basic connection – and now we have to EDIT our settings.
7. In Thunderbird go to right click on the Shared Email account you added and right click to get and select Settings:
8. Towards the bottom of the screen for Outgoing Server (SMTP) Click on Edit SMTP server
(In this example, the Shared Mailbox is ISTist-SWPU@uwaterlooswpu@uwaterloo.ca; and the primary user is smarkan@uwaterloo.ca
Look for Outgoing Server (SMTP) and Click Edit SMTP server
. )
9. Change the User Name to be your own 8 character UWaterloo username – in this example: smarkan@uwaterloo.ca. Click OK
10. Close and reopen Thunderbird and open the application. You will be prompted for the password for the Shared account you added. In this example the account is IST-SWPU@uwaterloo.ca – but we do not have that password:
. Enter an invalid Password and click SIGN IN Sign in
11. You will get a new login prompt that lets you change the UserNameusername.
12. Enter your Own own username – in this example the username is smarkan@uwaterloo.ca. Click Next.
Now Enter NEXT and complete 
13. Complete the login process by entering your own password and responding to the 2FA prompt.
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