Gmail

Gmail, officially Google Mail in Germany, Austria and the United Kingdom, is a free Web-based email (Webmail) and POP3 e-mail service provided by Google. It was released on April 1, 2004 as a private beta release by invitation only, and was opened to all as a public beta on February 7, 2007.

This service offers more than 2,880 megabytes of free storage (as of July 2007), a search-oriented interface and a unique 'conversation view'. Gmail is well-known for its use of the Ajax programming technique in its design.