1 EXHIBIT 11.1 Exhibit 11.1 ISOCOR STATEMENT OF COMPUTATION OF SHARES USED IN PER SHARE COMPUTATION (IN THOUSANDS) Three months ended Six months ended ------------------- ------------------- June 30, June 30, June 30, June 30, 1997 1996 1997 1996 -------- -------- -------- -------- Computation of shares used in net income (loss) per share: Weighted average common shares outstanding 9,378 9,222 9,361 6,180 Common equivalent shares attributable to stock options (treasury stock method) Common equivalent shares attributable to redeemable preferred stock ----- ----- ----- ----- Shares used in per share calculation 9,378 9,222 9,361 6,180 ===== ===== ===== =====