Office 365 - Thunderbird Exchange Configuration

Last Updated: 03/28/2018
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The following instructions step through the process of configuring your Office 365 Exchange Online account using Thunderbird for Mac or Windows.

Step 1

Open Thunderbird and click Create a new account (and select Email for Windows).

*Note: If you do not see this option, click on Local Folders from the left side menu

Step 2

Click the Skip this and use and my existing email button.

Step 3

Enter a your desired display name in the Your name field.

Step 4

For the Email field, enter your and then IdentiKey password in the Password field. When completed click, Continue.

Step 5

Click the Manual Config button.

Step 6

Enter the following for the server settings:

  • Incoming server: 
    • Server hostname:
    • Port: 993
    • SSL: SSL/TLS
    • Authentication: Normal Password
  • Outgoing server: 
    • Server hostname:
      • *Note: If you run into issues with using as the outgoing server; please try as an alternative.
    • Port: 587
    • Authentication: Normal Password

Step 7

In the Username fields, enter the following:

When finished, click Re-test.

Step 8

Click Done.

Step 9

Your account will be configured and begin synching mail.