To: Glenn Petersen who wrote (35 ) 9/22/2000 11:23:44 AM From: Glenn Petersen Respond to of 55 Principal stockholders: <TABLE> <CAPTION> Percent Beneficially Number of Owned Shares ----------------- Beneficially Before After Name and Address of Beneficial Owner Owned Offering Offering ------------------------------------ ------------ -------- -------- <S> <C> <C> <C> Science Applications International Corporation(1) 10260 Campus Point Drive San Diego, CA 92121............................ 17,343,933 21.6% % Lucent Technologies, Inc.(2) 2015 West Chestnut Street Alhambra, CA 91803............................. 8,323,632 10.4 Entities affiliated with Oak Investment Partners(3) One Gorham Island Westport, CT 06880............................. 7,482,480 9.3 Entities affiliated with Accel V L.P.(4) 428 University Avenue Palo Alto, CA 94301............................ 4,753,539 5.9 Entities affiliated with Thomas Weisel Capital Partners LLC(5) One Montgomery Street, Suite 3700 San Francisco, CA 94104........................ 8,196,723 10.2 Harry J. Carr(6)................................ 6,600,000 8.2 Richard W. Barcus(7)............................ 1,500,000 1.9 Krishna Bala(8)................................. 1,394,250 1.7 William B. Bunting(5)........................... 8,196,723 10.2 Michael M. Connors.............................. 0 * Jeffrey A. Feldman(9)........................... 2,459,016 3.1 Edward F. Glassmeyer(3)......................... 7,482,480 9.3 William A. Roper, Jr.(1)........................ 17,343,933 21.6 Richard C. Smith(1)............................. 17,343,933 21.6 Nicholas P. DeVito(10).......................... 900,000 1.1 Michael Hodges(11).............................. 1,090,410 1.4 John K. Kostibas................................ 258,600 * Farouque Mesiya(12)............................. 828,126 1.0 Executive officers and directors as a group (15 persons)....................................... 51,051,402 63.6 </TABLE> --------