Yahoo! Mail Contacts is your online address book. Use it to store contact information for friends, family, and your professional network You can access it with an Internet connection from any computer, anywhere. Handy!
The most basic use of Contacts is clicking a contact's email address, which opens the Compose window so you can send them an email. You can also use it with tools like Yahoo! Maps or Yahoo! Yellow Pages to find a contact's location or find businesses and attractions located near their address. Your Yahoo! Contacts stores up to 5,000 contacts. And in addition to being fully searchable, Contacts also gives you distribution lists—an easy way to send emails to up to 100 people at once.