Until now, however, if you wanted an e-mail address for your
personal use and weren't already at a university or company that
supplied you with one, you had to rent one, usually bundled together
with a package of other services, from an Internet access provider or
from an online service such as Prodigy, CompuServe, or America
Online. Such companies typically charge their subscribers between
$100 and $200 per year, and if you don't keep paying, you lose your
e-mail.
Juno aims to change all that. Juno provides e-mail service to anyone
with access to a personal computer and a modem, and it provides this
service at no cost to its members. To take advantage of the free
service, members just have to install on their computers a free
software package developed by Juno. The initial version of this
software package runs on PC-compatible computers under
Microsoft's Windows. operating system.
-- from http://www.juno.com/whatis.html