If you are OK with using a non-Yahoo email address, you have these other
solutions that will work with Windows Mail:
* Use the email address assigned to you by your ISP.
* Use a free Gmail, AOL, or Hotmail/Live account.
You can also continue to use Yahoo's webmail: http://mail.yahoo.com
If you need more help with any of these solutions, just ask.
You need to give us more details:
1) The name of your email program
2) The name of your email service provider (or the part of your email
address after the @ symbol)
3) Copies of any error messages you get. Right-click on your error
message, copy, then paste it into a reply here.
You've posted with an email address ending @microsoft.com. Two questions
come to mind:
1 Is this the address you are using for your email?
2 Do you actually work for Microsoft (as implied by your email address)?
If you answered yes to both questions, you should ask IT support for
help (see your internal phone directory for their number).
However, I'll bet you answered yes to question 1 and no to question 2.
If so, then your email is going to Microsoft who will either throw away
any emails that arrive for you or bounce them as undeliverable - because
you don't work there.