Microsoft Outlook will provide users to integrate different email accounts like Gmail, Hotmail and can integrate email accounts whose providers can provide SMTP and POP access. But Yahoo mail provider does not provide these free services for their users with free email account.
Yahoo does not provide SMTP and POP services to their premium users who are using Yahoo mail plus although it is a paid subscription.
So, This post is for Yahoo premium users who cannot access their email accounts from Microsoft Outlook Express.

How to access Yahoo Mail using Microsoft Outlook.

step 1 to access yahoo mail using Microsoft outlook.

You have to download an application called YPOPs. YPOPs is an application software that allows POP3 and SMTP access to yahoo mail.It acts as a gateway between Microsoft Outlook and Yahoo Mail. You can download this application from sourceforge.

Step 2 to access Yahoo mail using Microsoft Outlook.

Install this application (POPs) on your system. While installing keep default settings, this is a good way.But you can customize the settings in the following way.

• Go to Receiving Email, Under download category select UNREAD. This will download only the unread emails from your yahoo mail.
• Go to Sending Email, check Save email in Yahoo's Sent Items Folder.
• In Miscellaneous, it is very good to check Automatically start YPOPs! when Windows starts, so that Ypops will starts automatically when your windows starts

The 3rd step is to Configure Microsoft Outlook to access Yahoo! Mail

At last you should configure your Outlook Express . Here how you should configure.

• If you are using Microsoft Outlook express 2003, then go to TOOLS -> Email accounts -> Add new email account, Click NEXT ,Check POP3 and click NEXT.
• If you are using Microsoft Outlook Express 2007, TOOLS->Account settings -> under Email click NEW -> Add a new email account, Select these;Microsoft Exchange, POP3, IMAP, or HTTP.
  Under Add new email account check Manually configure server settings and additional server types.
• Then follow the procedure like Name, email address
• But under Incoming mail server i.e, POP3 to local host, If it does not work then use 127.0.0.1.
• Under Outgoing mail server i.e, SMTP type local host or 127.0.0.1.
• Type your user name (like ram123 for email address like ram123@yahoo.com) and password and check remember me
• Next go to SETTINGS , click on Outgoing server tab and check My outgoing server i.e,SMTP requires authentication.
• Ok->Finish

Ready to use yahoo mail with outlook express.