1. In your Outlook from the Tools menu, choose "Accounts."
2. Select the "Mail" tab.
3. Click the "Add" button.
4. From the Add menu, click "Mail."
5. In the text box labeled Display Name, type your name and click "Next."
6. In the Email Address box, type your Yahoo! Mail address (be sure to include "@yahoo.com") and click "Next."
7. Under "My incoming mail server is a..." select "POP3."
8. Type "pop.mail.yahoo.com" in the Incoming Mail (POP3, IMAP, or HTTP) Server box.
9. Type "smtp.mail.yahoo.com" in the Outgoing Mail (>SMTP) Server box.
10. Click "Next."
11. In the Account Name box, type your Yahoo! Mail ID (your email address without the "@yahoo.com").
12. In the Password box, type your Yahoo! Mail password.
13. If you want Outlook Express to remember your password, check the "Remember password" box.
14. Do not check the boxes labeled "Log on using Secure.."
15. Click "Next."
16. Click "Finish."
17. Select 'pop.mail.yahoo.com' under 'Account,' and click 'Properties.'
18. Click the "Servers" tab.
19. Under “Outgoing Mail Server” check the box next to “My server requires authentication”
20. Click the 'Advanced' tab.
21. Under “Outgoing mail Server (SMTP)”, check the box next to “This server requires a secure connection (SSL). Enter port number “465” in the “Outgoing mail (SMTP)” field.
22. Under “Incoming mail (POP3)”, check the box next to “This server requires a secure connection (SSL)". The port number in the “Incoming mail (POP3)" field should automatically change from 110 to 995. If it doesn’t, make sure the port number is set to 995.