These instructions are for computers running Windows XP:

    1. Click on the Start button.
    2. Select Control Panel.
    3. In the left column, under Control Panel Home, click on Switch to Classic View. (If it says Switch to Category View, you are already in Classic View.)

    4. Double-click on Add or Remove Programs.
    5. In the left column, click on Set Program Access and Defaults.
    6. Click on the button next to Custom. (You can also double-click on the word Custom or click on the double arrows to the right of the word Custom.)
    7. Under the section "Choose a default e-mail program:" click on the button next to Mozilla Thunderbird.
    8. Click OK.
    9. Close the Control Panel window.

Last Modified March 13, 2008