X0101 4 2003-05-22 0 0001036425 MICROMUSE INC MUSE 0001201232 BROWN GREGORY 1 0 0 0 Common Stock 2003-05-21 4 M 0 60000 5.42 A 62410 D Common Stock 2003-05-21 4 S 0 60000 7.9737 D 2410 D Non-Qualified Stock Option (right to buy) 5.42 2003-05-21 4 M 0 60000 0 D 2002-04-01 2011-10-01 Common Stock 60000 200000 D The Option shall become exercisable with respect to (i) one-sixth (1/6) of the Option Shares upon Optionee's completion of six (6) months of Service measured from the Grant Date and (ii) the balance of the Option Shares in a series of thirty (30) successive equal monthly installments upon Optionee's completion of each additional month of Service over the thirty (30) month period measured from the six (6) month anniversary of Grant Date. As of 3/27/2003 the shares purchasable under this option grant became fully vested and exercisable. By: LeeAnn Linck, Attorney In Fact For: Gregory Brown 2003-05-21