How do I delete/remove my Penn State Email Account in Thunderbird when I receive a note about Microsoft Basic Authentication?

Modify your PSU email account in Thunderbird: 

        1. Open Thunderbird.
        2. Select Edit -> Account Settings -> Server Settings.
        3. Find an Authentication method and change it to Oauth2.
        4. Instead of Server settings, find Outgoing Server ( SMTP).
        5. Find smtp.office365.com and click edit.
        6. For the authentication method, select Oauth2. 

 Add a new PSU email account in Thunderbird 

        1. Follow this article - KB0012916 to set up your account.

 Remove the Old PSU email account in Thunderbird  

        1. Select Edit -> Account Settings.
        2. Select Account Actions -> Remove account.