Win Web Hosting

You don’t say if you already have an Outlook Ex. account (or ?what else)———–SO, I don’t know if this will solve your problem or not—-but it’s worth a try.
IF you’re using Internet Ex. AND have a Yahoo Mail account.

Internet Explorer picks a default mail client (if you haven’t), and it’s–”usually”–Outlook Ex or Hotmail.
Soooooo if you don’t have an account in either one—that’s what it means by “can’t find Host”—–so, you have to get an account with whatever IE choose.

OR—-change the “default client” to Yahoo (which is easier in the long run)

Click this link, from Yahoo, for detailed instructions on making Yahoo your default mail client on Internet Explorer.
You WILL be required to download their “newest” toolbar—-use the “download” link that is on that page, to be SURE and get the correct one.

That download adds Yahoo! Mail to your PC’s list of email programs to choose from. (follow the prompts)

Then, after you’ve chosen Yahoo! Mail as your PC’s default email application, Yahoo! Mail will open when you click “any” email link in “any” browser.
http://help.yahoo.com/l/us/yahoo/mail/original/settings/settings-10.html