Is it possible for windows to use yahoo as my default e-mail program?

if i try to send a "link" to someone i can't .

Is it possible for windows to use yahoo as my default e-mail program?microsoft excel

It is not possible that windows use yahoo default email.

Is it possible for windows to use yahoo as my default e-mail program?microsoft updates internet explorer

try this it will work you need to go to internet options in control panel and set yahoo as you default mail.
No, read this and see why:

Windows uses an email client to send e-mail. Something like Outlook or Outlook Express. Yahoo is an online e-mail service provider. Unless you have your own email server (If you're a home user I seriously doubt you do) you use an online e-mail service such as Yahoo, Hotmail, Netscape or G-mail. To use your e-mail client (which is what Windows is trying to get you to do) You will need to set up your e-mail service provider with your e-mail client. This can be a tedious process and requires a lot of steps.

All in all, don't use it unless you have to and I recommend you don't