So you’re on Internet Explorer 8 and click a link that’s supposed to bring up your email client (Outlook, Thunderbird etc.) and email something to whoever the “mailto:” link was set to.

But instead of your mail client popping up you get an error message stating something to the effect that your mail client isn’t defined.

Here is a step by step guide of how you quickly set your favorite mail client as default email program in Internet Explorer 8.