<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINING SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED BALANCE SHEET AT NOVEMBER 30, 1999 (UNAUDITED) AND THE
CONSOLIDATED STATEMENT OF OPERATIONS FOR THE SIX MONTHS ENDED NOVEMBER 30, 1999
(UNAUDITED) IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-2000
<PERIOD-START>                             JUN-01-1999
<PERIOD-END>                               NOV-30-1999
<CASH>                                           7,255
<SECURITIES>                                   101,797
<RECEIVABLES>                                   13,906
<ALLOWANCES>                                       852
<INVENTORY>                                          0
<CURRENT-ASSETS>                               125,576
<PP&E>                                          19,323
<DEPRECIATION>                                  14,007
<TOTAL-ASSETS>                                 147,996
<CURRENT-LIABILITIES>                           20,817
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            31
<OTHER-SE>                                     127,148
<TOTAL-LIABILITY-AND-EQUITY>                   147,996
<SALES>                                         24,567
<TOTAL-REVENUES>                                36,482
<CGS>                                              317
<TOTAL-COSTS>                                    4,227
<OTHER-EXPENSES>                                27,424
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  16
<INCOME-PRETAX>                                  6,950
<INCOME-TAX>                                       300
<INCOME-CONTINUING>                              6,650
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     6,650
<EPS-BASIC>                                     0.23
<EPS-DILUTED>                                     0.20