1.From the Tools menu, choose “Email Accounts.”

2.Select the radio button next to “Add a new email account” and click the “Next” button.

3.Select your Yahoo! Mail account and click “Properties.”

4.Select the “Advanced” tab.

5.In the Delivery section at the bottom of the window, is the box next to “Leave a copy of messages on server” checked? Good…if you want to keep your messages on the server. If you want to delete your messages from the Yahoo! Mail server, un-check this box.