<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS OF CITADEL COMPUTER SYSTEMS INCORPORATED AS OF THE QUARTER
ENDED NOVEMBER 30, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   9-MOS
<FISCAL-YEAR-END>                          FEB-28-1997             FEB-28-1996
<PERIOD-START>                             MAR-01-1996             MAR-01-1995
<PERIOD-END>                               NOV-30-1996             NOV-30-1995
<CASH>                                         247,153                 125,565
<SECURITIES>                                 1,285,250                       0
<RECEIVABLES>                                3,535,442                 484,336
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                             5,314,821               3,298,078
<PP&E>                                         709,131                 110,327
<DEPRECIATION>                                       0                       0
<TOTAL-ASSETS>                              10,885,149               6,414,863
<CURRENT-LIABILITIES>                        4,499,249               6,065,014
<BONDS>                                      1,141,251                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                  1,190,000                       0
<COMMON>                                       156,926                 115,091
<OTHER-SE>                                   3,897,723                 200,398
<TOTAL-LIABILITY-AND-EQUITY>                10,885,149               6,414,863
<SALES>                                      4,390,208               1,079,530
<TOTAL-REVENUES>                             4,390,208               1,079,530
<CGS>                                          246,413                 113,124
<TOTAL-COSTS>                                        0                       0
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                             292,329                 232,831
<INCOME-PRETAX>                             (6,332,279)               (709,540)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                         (6,332,279)               (709,540)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                468,146                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                (5,864,133)               (709,540)
<EPS-PRIMARY>                                     (.46)                   (.11)
<EPS-DILUTED>                                        0                       0
        

</TABLE>