<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<CIK> 0000927653
<NAME> McKESSON HBOC, INC.
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-START> APR-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 452,300
<SECURITIES> 38,100
<RECEIVABLES> 3,423,600
<ALLOWANCES> 322,800
<INVENTORY> 4,303,300
<CURRENT-ASSETS> 8,080,900
<PP&E> 1,169,500
<DEPRECIATION> 617,200
<TOTAL-ASSETS> 10,488,400
<CURRENT-LIABILITIES> 5,192,300
<BONDS> 1,236,400
195,800
0
<COMMON> 2,800
<OTHER-SE> 3,613,400
<TOTAL-LIABILITY-AND-EQUITY> 10,488,400
<SALES> 9,728,500
<TOTAL-REVENUES> 9,728,500
<CGS> 9,145,700
<TOTAL-COSTS> 9,621,700
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 27,400
<INCOME-PRETAX> 106,800
<INCOME-TAX> 41,700
<INCOME-CONTINUING> 63,600
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<EPS-BASIC> 0.23
<EPS-DILUTED> 0.22
</TABLE>