<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS AND CONSOLIDATED STATEMENTS OF OPERATIONS FOUND
WITHIN THE FORMS 10Q AND 10-K OF IA AND IQ AS OF AND FOR THE PERIODS INDICATED
BELOW, AS RESTATED TO REFLECT THE SEPTEMBER 1998 POOLING OF IA AND IQ AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          JAN-31-1998             JAN-31-1999             JAN-31-1999             JAN-31-1999
<PERIOD-START>                             FEB-01-1997             FEB-01-1998             FEB-01-1998             FEB-01-1998
<PERIOD-END>                               JAN-31-1998             APR-30-1998             JUL-31-1998             OCT-31-1998
<CASH>                                          27,765                  15,091                  17,480                  17,958
<SECURITIES>                                     9,177                  19,635                  18,931                  16,351
<RECEIVABLES>                                   14,206                  16,499                  16,748                  20,318
<ALLOWANCES>                                   (1,030)                 (1,047)                 (1,078)                   (879)
<INVENTORY>                                          0                       0                       0                       0
<CURRENT-ASSETS>                                51,690                  51,888                  54,486                  61,099
<PP&E>                                          10,600                  11,030                  11,443                  11,963
<DEPRECIATION>                                 (6,744)                 (7,228)                 (7,743)                 (8,200)
<TOTAL-ASSETS>                                  59,246                  59,252                  61,397                  68,123
<CURRENT-LIABILITIES>                           14,434                  13,564                  14,182                  18,600
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                           247                     247                     248                     248
<OTHER-SE>                                      43,822                  44,763                  46,287                  49,147
<TOTAL-LIABILITY-AND-EQUITY>                    59,246                  59,252                  61,397                  68,123
<SALES>                                              0                       0                       0                       0
<TOTAL-REVENUES>                                50,293                  15,271                  32,091                  50,582
<CGS>                                                0                       0                       0                       0
<TOTAL-COSTS>                                   12,677                   3,657                   7,260                  10,994
<OTHER-EXPENSES>                                42,162                  10,861                  22,871                  42,849
<LOSS-PROVISION>                                     0                       0                       0                     242
<INTEREST-EXPENSE>                               (210)                    (12)                    (20)                    (28)
<INCOME-PRETAX>                                (4,039)                   1,153                   2,758                 (2,094)
<INCOME-TAX>                                       506                     325                     717                 (6,860)
<INCOME-CONTINUING>                            (4,545)                     828                   2,041                   4,766
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                   (4,545)                     828                   2,041                   4,766
<EPS-PRIMARY>                                   (0.38)                    0.03                    0.08                    0.19
<EPS-DILUTED>                                   (0.38)                    0.03                    0.08                    0.18
        

</TABLE>