I presume you have installed Thunderbird and created a mail account. Then you need to set Thunderbird as the default email client. * http://kb.mozillazine.org/Default_mail_client Control Panel > Default programs click on 'Set default Programs' Select Thunderbid click on 'Set this program as default' click on OK Then check Clickon 'Set program Access and computer defaults'. Select 'custom' and click on the down arrows to extend the view. choose a default email program Select 'Mozilla Thunderbird and select 'Enable access to this program' Do not select any other. If TB is running then it will auto select 'Use my current e-mail program' click on OK