You can access the POP configuration tool in one of two places, depending on what kind of user you are:
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If you're an owner or an administrator of a Business Mail or Custom Mailbox account:
Visit the Email Control Panel, and click "Additional Options." In the POP/SMTP section, click the "Try it now" link.

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If you were given a Business Mail email address:
You can find a link to the tool in the invitation you received about your new email address. Scroll down to the "Set Up POP Access" section and click the "Try it now!" link. (If you received a text or print invitation, you'll have to type the link into your browser's address bar.)

Note: For security reasons, the POP configuration tool works only with Busines Email addresses associated with a Yahoo! or an AT&T Yahoo! ID.