Thunderbird O365

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Thunderbird O365

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Dialog pop-up to interact with O365 in order to perform the 2FA authentication and get a token that Thunderbird can then re-use for the duration of the session. This should be doable via either Thunderbird directly or via an account authentication plug-in infrastructure. MailsDaddy Thunderbird to Office 365 migration tool is the best GUI based utility that helps in each step to import Thunderbird MBOX file to Office 365, Outlook.com & Exchange Server. Simple and User-friendly interface; Export Thunderbird files to Office 365, Exchange Server, Outlook.com and PST format.

Thunderbird lacks Exchange support so it needs to be configured for IMAP. With IMAP you can only access your email, not your calendars, contacts, or tasks. To request access to IMAP, please submit a Help request.

Get Thunderbird

You can obtain a free download of Thunderbird from the Mozilla website. Follow the instructions on the site for installing Thunderbird. These instructions require Thunderbird version 78 or later.

Set up a new Thunderbird account

After installing Thunderbird you need to configure it for use with your @stanford mailbox.

Thunderbird O365
  1. Launch Thunderbird and choose to create a new Email account.
  2. When asked if you would like a new email address, click Skip this and use my existing email.
  3. Enter your name as you want it to appear in the From field in outgoing mail and your email address. Then, click Continue.
  4. Thunderbird will attempt to automatically configure your account settings. This will fail and a message saying 'Thunderbird failed to find the settings for your email account' will display. Enter the following settings:
    Incoming:
    • IMAP
    • Server hostname: outlook.office365.com
    • Port: 993
    • SSL: SSL/TLS
    • Authentication: Oauth2
    Outgoing:
    • Server hostname: smtp.office365.com
    • Port: 587
    • SSL: STARTTLS
    • Authentication: Oauth2
    Username (Incoming and Outgoing): your SUNet ID@stanford.edu
    Note: If you do not have OAuth2 as an authentication choice you can click the Re-test button after filling in the server information.
  5. Click Done. The Thunderbird main window displays.
  6. You should be prompted to complete the normal web-based two-factor authentication process.

Additional account settings

We recommend that you configure your Thunderbird to move your deleted messages to the Deleted Items folder on the server (webmail). This setting allows you to recover deleted items. We also recommend keeping sent messages and drafts in the Sent Items and Drafts folders in webmail folders on the server. This will make it less confusing if you also use webmail or another email client to access your Office 365 email.

  1. Right-click your @stanford.edu account name and click Subscribe.
  2. Make sure the Deleted Items, Drafts, and Sent Items folders (and any other folders you want to access in Thunderbird) are selected and then click Subscribe.
    Note: Do not subscribe to the Calendar folder.
  3. Click your @stanford.edu account name to display the Thunderbird main window. Under Accounts, click View settings for this account.
  4. In the Accounts Settings window, click Server Settings in the left panel. In the Server Settings section of the window, When I delete a message, select Move it to this folder and then choose the Deleted Items folder on the server.
  5. Click Copies and Folders in the left panel and make the following changes:
    • When sending messages automatically, place a copy in: select Other and choose the Sent Items folder on the server.
    • Keep message drafts in: select Other and choose the Drafts folder on the server.
  6. Click Junk Settings in the left panel.
  7. Uncheck the box for Enable adaptive junk mail controls for this account.
    Note: Server side junk/spam filtering is already enabled for Office 365 accounts.
  8. Click OK to save your changes and close the Account Settings window.

Known issues

The following are known issues with Thunderbird:

  • When sending mail, Thunderbird may hang on the step 'Copying Mail to Sent folder.'
  • You may see an error message that says, 'Error copying mail to Sent folder' with a prompt to retry.

To resolve these issues:

  1. In Thunderbird, go to the Tools menu and click Accounts Settings.
  2. In the left panel, click Server Settings.
  3. In the Server Settings section of the window, click the Advanced button.
  4. Change the Maximum number of server connections to cache to 1 and then click OK.
  5. Click OK to close the Account Settings window.

This article explains how to configure the Mozilla Thunderbird email client to receive your Illinois State University Office 365 email account.

Add your Office 365 email to Thunderbird

To configure Thunderbird, do the following:

  1. Open Thunderbird.
  2. Click the Thunderbird Menu icon (three horizontal bars) at the upper-right of the Thunderbird pane.


Image Description: A screenshot of the settings button within Thunderbird.

  1. Hover your cursor over Options and click Account Settings.
    Image Description: A screenshot of the “Account Actions” tab within Thunderbird’s advanced account settings.
  2. Click Account Actions and then select Add Mail Account….
  3. Enter your name in the field labeled Your Name.
  4. Enter your email address in the field labeled Email Address (i.e. yourULID@ilstu.edu).


Image Description: A screenshot of the section where you will enter your personal information. Press Continue after entering your sensitive account information.

  1. Enter your ULID password in the field labeled Password, and then click Continue. Configuration found at email provider will appear, but you have to click Manual Config.

Please Note: Thunderbird will automatically try to set up the connection using default configurations, but you will need to click the Manual Config button to enter the correct configuration.


Image Description: A screenshot of the account set up page. Here, you will click “Manual Config” so that you can manually enter the information posted in this article to ensure you are correctly configuring your account.

  1. For Incoming Server hostname enter outlook.office365.com,change Port to 993, change SSL to SSL/TLS and Authentication is Normal password.
  2. Enter smtp.office365.com in the Outgoing Server hostname field, change Port to 587, change SSL to STARTTLS and Authentication is Normal password.
  3. Enter your complete email address (i.e. yourULID@ilstu.edu) in the Incoming and Outgoing Username fields.


Image Description: A screenshot of the email account set up page.

  1. Click the Re-test button. You should get a message stating, “The following settings were found by probing the given server”.


Image Description: A screenshot of the email account set up page. Click “Re-Test” to ensure that the credentials you have entered are correct, then you will click connect.

  1. Click the Done button.
  2. Click OK to close the Account Settings window.

Thunderbird is now configured for use with your Office 365 email account.

Important: All of your folders will not automatically be viewable in Thunderbird. To be able to view all of your folders, see the section below, entitled “How to View Your Folders in Thunderbird”.

Not working? Make sure you entered your email and password correctly and try again. Also, be sure to update the server to outlook.office365.com vs .edu.

How to View Your Folders in Thunderbird

You may view all, or some, of your folders in Thunderbird. In order to do so:

  1. Within Thunderbird, click on your email address, on the left side of the Thunderbird window.
  2. Under Advanced Features, click Manage Folder Subscriptions.
  3. A pop-up window will open, entitled Subscribe, which will display all of the existing folders for your email account. Place a check to the right of any folders you would like to be able to view within Thunderbird.

Thunderbird O365 Parts


Image Description: A screenshot of the Advanced Features section with an arrow pointing to the “Manage Folder Subscriptions” button.

Note: You will need to click the arrows to the left of any expandable folders in order to be able to view and select any sub-folders for subscription.

  1. Once you have selected all of the folders you would like to be able to view, click Subscribe > OK.

You will now see the selected folders underneath your email address within Thunderbird.

Important: The new folders will not automatically populate with your email messages. When you click on a folder to view the contents, Thunderbird will then sync your email for the selected folder.

Removing an Email Account from Thunderbird

For information regarding how to remove an email account from Thunderbird, please refer to:

How to Get Help

For technical assistance, you may contact the Technology Support Center at (309) 438-4357, or by email at SupportCenter@illinoisstate.edu.

Thunderbird O365 Mfa

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