posted on Sep, 3 2009 @ 05:56 AM
Okay this is easy to do in vista...
first click the start button, the blue circle with the windows flag bottom left corner...
When you get the fly-out look right under the Control Panel tab for one that says "Default Programs"! click on that
The first selection that reads "Set your Default Programs" is the one you want...
Now in my list Yahoo mail client is at the bottom of the list, (If you don't have it on yours you'll need to go to Yahoo and download it) Click on
the Yahoo from the list and in the right panel you'll get a Set as default.. click that and your done..