Office 365, Email, Exchange, Thunderbird

Mozilla Thunderbird is a free and open-source email, calendar, and newsfeed program developed by the Mozilla Foundation.

Technology Services does not officially support or recommend Thunderbird. University of Illinois email inboxes are known to be able to send and receive messages after some specific configuration, though users should understand that the only methods of using University email that Technology Services is able to support are the Outlook desktop software or Outlook website interface that are developed by Microsoft.

Thunderbird is not able to automatically detect the correct settings for University accounts, so check this manual configuration even if it appears that your account is already present in Thunderbird.

Navigate to the Account Settings menu by way of the Tools menu, the triple-bar in the upper right, or the gear icon in the lower left.

Server Settings

The side panel of the Account Settings screen will have a heading of your University email address; under this heading, click Server Settings and input the following:

  • Server Name: outlook.office365.com
  • Port: 993
  • User Name: your full University email address
  • Connection security: SSL/TLS
  • Authentication method: OAuth2

Outgoing Server (SMTP)

The side panel of the Account Settings screen will have an entry for Outgoing Server (SMTP); click this, then select your University account from the list, then click Edit... and input the following:

  • Server Name: smtp.office365.com
  • Port: 587
  • Connection security: STARTTLS
  • Authentication method: OAuth2
  • User Name: your full University email address

Caveats

The above settings have been verified to function in Thunderbird versions 91 and 102 running on Windows 10, but should be valid for any version 78 or later on any operating system. There are some caveats to using Thunderbird with your University account:

  • the OAuth2 authentication method may not appear until after the office365 Server Name is input; if it does not appear, try closing and reopening Thunderbird
  • the first time Thunderbird tries to send or receive mail with the OAuth2 protocol, it will produce a popup with a University-branded page prompting for your password; input it to reach a page asking for permissions; Thunderbird will not function properly unless you click the Accept button on this permissions page
    • if the password field goes blank instead of proceeding to the permissions page, turn on Accept cookies from sites in Thunderbird's Privacy settings
  • Thunderbird will not retrieve inbox subfolders that already exist, but seems to be able to create and upload them
  • Technology Services Help Desk consultants do not use or support Thunderbird, and will not be able to provide support beyond the information on this page; we strongly recommend that you use the Outlook web interface, or the installed desktop software if your account is licensed for it. 



Keywords:Exchange, email, calendar, Thunderbird, IMAP, SMTP, SMTP-Illinois, STARTTLS, Exchange, migrations, office 365   Doc ID:47659
Owner:Jackson M.Group:University of Illinois Technology Services
Created:2015-02-26 12:10 CDTUpdated:2022-08-25 11:32 CDT
Sites:University of Illinois Technology Services
Feedback:  13   6