I have installed Mozilla thunderbird as my default email client by setting in Control panel->Internet options. Now whenever i goto Msword File->sendto Mail recepients i get Thunderbird as the mail client. However in the presence of a third party com addin to office 2003(which is a menu to office) installed. Whenever I do MSword File ->Sendto Mail recepient i get Outlook started instead of Thunderbird, though in the internet options thunderbird is selected as the default still. We need to get Thunderbird as the default email client when File ->sendto is done even in the presence of Addin.Could anybody help me out on what might be the cause here and any solution for the problem will be welcome.