[Yahoo! Mail] (http://mail.yahoo.com) is a free service available in over 20 languages that provides users with an e-mail functionality and experience, including spam and virus protection, unlimited free storage, attachment size capacity, search capabilities and address book functionality. Yahoo! Mail generates revenues primarily from display advertising and premium user fees.
In addition to its basic e-mail service, for a subscription fee, Yahoo! offers [Yahoo! Mail Plus] (http://overview.mail.yahoo.com/enhancements/mailplus), a mail service providing a number of features, including access via e-mail applications, such as Outlook, spam protection, additional attachment size capacity, and a display ad-free interface. In 2007, it released for general availability a new version of Yahoo! Mail.