PROSPECTUS SUPPLEMENT                           Filed Pursuant to Rule 424(b)(3)
(TO PROSPECTUS DATED FEBRUARY 13, 2001)         Registration No: 333-50760




                                10,000,000 SHARES

                           JUNO ONLINE SERVICES, INC.

                                  COMMON STOCK


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      The purpose of this prospectus supplement is to provide supplemental
information regarding Juno Online Services, Inc. in connection with the offering
of shares of its common stock by The Kingston Limited Partnership as described
in Juno's prospectus dated February 13, 2001. You should read this prospectus
supplement and the related prospectus carefully before you invest. Both
documents contain information you should consider when making your investment
decision.



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      On February 7, 2001, Juno Online Services, Inc. delivered a drawdown
notice to The Kingston Limited Partnership in accordance with the terms of the
common stock investment agreement to which each of Juno and Kingston is a party
and, as a result, a purchase period commenced on February 8, 2001 and is
expected to terminate on March 12, 2001. On February 14, 2001, Kingston and Juno
agreed to a mutual waiver under the common stock investment agreement. The
mutual waiver will be effective only for purchases and sales occurring during
the portion of the current purchase period on or after February 15, 2001.
Pursuant to the mutual waiver, Juno and Kingston have agreed that,
notwithstanding any provision of the common stock investment agreement, the
floor price and the company designated minimum price for the current purchase
period will be equal to $1.50. As a result of this mutual waiver, sales to
Kingston under the common stock investment agreement during the portion of
this purchase period on or after February 15, 2001 may occur at prices as
low as $1.50 per share. Accordingly, during this purchase period, Kingston
will generally not be required to purchase shares of our common stock on a
given day if our volume-weighted average stock price during such day is less
than $1.60 per share. Absent the mutual waiver, Kingston would not be
obligated to purchase shares of our common stock on trading days during which
our volume-weighted average stock price were less than $2.66 per share.


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          THE DATE OF THIS PROSPECTUS SUPPLEMENT IS FEBRUARY 14, 2001.