How Can I Unlink Windows & Yahoo?
- 1). Open a Web browser window and navigate to the Account Management page at Live.com.
- 2). Type your Windows Live ID and password into their respective fields, and then click the "Sign In" button.
- 3). Click "Your Email Addresses" in the "Other Options" section at the bottom of the window.
- 4). Click the "Remove" link to the right of the Yahoo! email address that you wish to unlink.
- 5). Click the "Remove" button to confirm the removal of the email address.
Source...