Main article: Gmail

Gmail, known in the United Kingdom and Germany as Google Mail, is a free webmail, POP3 and IMAP service provided by Google. It was launched as an invitation-only beta release on April 1, 2004, and became available to the general public as a beta product on February 7, 2007. The service was upgraded from beta status on July 7, 2009, along with the rest of the Google Apps suite, at which time it had 146 million users monthly.[citation needed]. With an initial storage capacity offer of 1 GB per user, Gmail significantly increased the webmail standard for free storage from the 2 to 4MB its competitors offered at that time. The service currently offers over 7400 MB of free storage with additional storage ranging from 20 GB to 1 TB available for $5 to $256 (US) per year.

Gmail has a search-oriented interface and a "conversation view" similar to an Internet forum. Software developers know Gmail for its pioneering use of the Ajax programming technique.

Gmail runs on Google Servlet Engine and Google GFE/1.3 which run on Linux