<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED FINANCIAL STATEMENTS OF JUNO ONLINE SERVICES, INC. AND
SUBSIDIARIES FOUND IN THE COMPANY'S FORM 10-Q AS OF AND FOR THE NINE MONTHS
ENDED SEPTEMBER 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                          68,648
<SECURITIES>                                         0
<RECEIVABLES>                                   15,130
<ALLOWANCES>                                     1,557
<INVENTORY>                                          0
<CURRENT-ASSETS>                                89,727
<PP&E>                                          17,068
<DEPRECIATION>                                   7,682
<TOTAL-ASSETS>                                 100,015
<CURRENT-LIABILITIES>                           54,292
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           389
<OTHER-SE>                                     206,400
<TOTAL-LIABILITY-AND-EQUITY>                   100,015
<SALES>                                         83,745
<TOTAL-REVENUES>                                83,745
<CGS>                                           44,257
<TOTAL-COSTS>                                   44,257
<OTHER-EXPENSES>                               163,836
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 131
<INCOME-PRETAX>                              (119,813)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                          (119,813)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 (119,813)
<EPS-BASIC>                                     (3.13)
<EPS-DILUTED>                                   (3.13)