The Thunderbird client will need to set to accept OAuth2 authentication in order to receive emails from the Exchange servers.

  1. Launch Thunderbird
  2. In Mail Account Setup, enter the following:
    • Name
    • Email 
    • Do NOT enter your password on this login screen
  3. Click Continue
  4. Thunderbird will discover your server settings Protocol, Incoming, Outgoing, and Username server settings
  5. Click Done to confirm your account has been created
    • You will be prompted to enter your password if you try to navigate to your mailbox. Click Cancel instead of entering it.
  6. Navigate to Account Settings
  7. In the Server Settings section, find Security Settings
  8. Select OAuth2 from the Authentication Method dropdown
  9. On the left panel, select Outgoing Server (SMTP)
  10. Select the Office365 (Microsoft) SMTP server and click edit on the right side
  11. Change the Authentication method to OAuth2 and click Ok
    • Description: Office365 (Microsoft)
    • Server Name:
    • Port 587 (default)
    • Connection Security: STARTTLS
    • Authentication Method: OAuth2
    • Username:
  12. Navigate to your inbox and authenticate using Microsoft's Multi-Factor Authentication.
Sync Time
Email data may take some time to sync after setting up OAuth2 for Thunderbird.

Reconfigure Folder Mapping

We recommend configuring Thunderbird to use these same primary folders as Microsoft Exchange.

  1. Right-click on your Office 365 account and select Subscribe... from the drop down menu
  2. Place a check mark within the box next to each of these folders:
    • Drafts
    • Deleted Items
    • Sent Items
  3. Click the Subscribe button
  4. Click Ok
  5. Right-click on your Office 365 account and select Settings... from the drop down menu
  6. Select Server Settings
  7. Under the "When I delete a message" section, select Move it to this folder and set the folder to Deleted Items
  8. In your Office 365 account, select Copies & Folders
  9. In the section "When sending messages, automatically place a copy in..." select Other and set it to the Sent Items option.
  10. Make sure the Drafts folder is selected under Drafts and Templates
  11. Click Ok
  12. Restart your Thunderbird client