EXHIBIT 5

             OPINION AND CONSENT OF BROBECK, PHLEGER & HARRISON LLP



                                 August 22, 2000



Juno Online Services, Inc.
1540 Broadway
New York, NY 10036

            Re:    Juno Online Services, Inc. - Registration Statement
                   for Offering of an Aggregate of 3,848,335 Shares of
                   Common Stock
                   ----------------------------------------------------

Dear Ladies and Gentlemen:

            We have acted as counsel to Juno Online Services, Inc., a Delaware
corporation (the "Company"), in connection with the registration on Form S-8
(the "Registration Statement") under the Securities Act of 1933, as amended, of
an additional 3,848,335 shares of common stock (the "Shares") authorized for
issuance under the Company's 1999 Stock Incentive Plan (the "Plan").

            This opinion is being furnished in accordance with the requirements
of Item 8 of Form S-8 and Item 601(b)(5)(i) of Regulation S-K.

            We have reviewed the Company's charter documents and the corporate
proceedings taken by the Company in connection with the establishment of the
Plan. Based on such review, we are of the opinion that, if, as and when the
Shares have been issued and sold (and the consideration therefor received)
pursuant to the provisions of option agreements or direct stock issuances duly
authorized under the Plan and in accordance with the Registration Statement,
such Shares will be duly authorized, legally issued, fully paid and
nonassessable.

            We consent to the filing of this opinion letter as Exhibit 5 to the
Registration Statement.

            This opinion letter is rendered as of the date first written above
and we disclaim any obligation to advise you of facts, circumstances, events or
developments which hereafter may be brought to our attention and which may
alter, affect or modify the opinion expressed herein. Our opinion is expressly
limited to the matters set forth above and we render no opinion, whether by
implication or otherwise, as to any other matters relating to the Company, the
Plan or the Shares.



                                    Very truly yours,

                                    /s/ Brobeck, Phleger & Harrison LLP


                                    BROBECK, PHLEGER & HARRISON LLP