"Several years ago, Google unveiled its web-based mail system. The mail
service dubbed Gmail caused quite a stir in its early days, since one
could only use it by invite. If you knew no one with access to Gmail’s
service, then you were left out in the cold with Yahoo!Mail or Hotmail
to keep you warm. Today Gmail opens its doors to anyone who wishes to
open an account. For today’s user, the stock Gmail account provides a
robust spam filter, interesting conversation categorization options,
enormous storage capacity, and much more."