If you really mean "Outlook" you are in the wrong newsgroup.
The newsgroup to which you posted is for the Windows Mail program.
You are more likely to find Outlook experts in the Outlook newsgroup:
microsoft.public.outlook.general (via NNTP), or via the web:
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.