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1. Open a terminal, install and/or update thunderbird to latest version by running these commands for Ubuntu:

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   sudo apt update sudo apt install thunderbird sudo apt upgrade thunderbird

   Or these commands for CentOS:

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   sudo yum clean all sudo yum install thunderbird sudo yum upgrade thunderbird

2. In your terminal window, start Thunderbird by typing 'thunderbird' in your terminal window:

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   thunderbird

3. If you are prompted to "Set up an Existing Email Account", close this window, click cancel, or select "I think I'll configure my account later".
4. Select the menu button in the upper right (the box with three lines in it).
5. Select: Add-ons.
6. Click the button that says "browse all add-ons".
7. Type "owl" in the search dialog box.
8. Select the choice that shows up which says "Owl for Exchange".
9. Click "+ Add to Thunderbird"
10. Under "Tools -> Add ons", click on "Owl for Exchange", and click "Preferences"
11. Click "Add new account Manually"
    1. Enter your SLAC email address.
    2. Next to Username, it should contain your full email address, eg, username@slac.stanford.edu
    3. Keep the "Outlook Web Access" protocol button selected.
    4. Keep the "Login method" choice to the default of "Detect automatically"
    5. Next to Webmail page, enter:  https://outlook.office365.com
       Here is an example screenshot:
       
    6. Click "Create account"
12. You will be prompted with the familiar Windows authentication page that looks like this:
    
13. After you sign in on the above page with your Windows credentials, you will see the familiar Duo authentication page:
    
14. After you authenticate with Duo, your account should be all created. You can close the "Add-ons Manager" tab in Thunderbird, or just click over to the "Inbox" tab to access your SLAC email. You will not have to enter your Windows credentials, or perform Duo authentication every time you use Thunderbird.
      
    

Calendar

As a bonus, the Calender integration with Outlook seems to work also. It will take some time all your email and calendar entries to be loaded the fist timeWe have not tested the calendar integration possibilities with Thunderbird/Owl and the Outlook Calendar. The "lightening" Add-on does seem to have some integration with Owl (ie, it seems to be possible to at least view the Outlook calendar when Owl is configured). However, the purpose of Owl support at SLAC is to integration IMAP email and Outlook Web Access (there is no guarantee that calendar integration will work).

Why Owl was chosen over some alternatives

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