Yahoo! provides internet communication services such as Yahoo! Messenger and Yahoo! Mail, the largest e-mail service in the world, with almost half the market share.[64] In March 2007, Yahoo! announced that their e-mail service would offer unlimited storage beginning May 2007.
Yahoo! Mail premium service MailPlus provides additional functionality including POP/SMTP access to Yahoo! Mail accounts, although such functionality is already provided for free by Yahoo! competitor Gmail. Some MailPlus subscribers have reported difficulties in successfully cancelling their subscriptions, which are automatically renewed and paid by credit card. Although other areas of the MailPlus web interface appear to function correctly, a blank page appears when users select "cancel service" from the list of options to manage the service. It is unknown whether this is an accidental oversight by Yahoo! programmers, or a deliberate attempt to retain MailPlus subscription cash flows.
Yahoo! also offers social networking services and user-generated content in products such as My Web, Yahoo! Personals, Yahoo! 360°, Delicious, Flickr, and Yahoo! Buzz.
Yahoo! Photos was shut down on September 20, 2007 in favor of Flickr. On October 16, 2007, Yahoo! announced that they will no longer provide support or perform bug fixes on Yahoo! 360° as they intend to abandon it in early 2008 in favor of a "universal profile" that will be similar to their Mash experimental system.