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, 1996 1995 1996 1995 ---- ---- ---- ---- Computation of shares used in net income (loss) per share: Weighted average common shares outstanding............... 8,747 1,189 5,705 1,189 Common equivalent shares attributable to stock options... (treasury stock method)................................ - 173 - 173 Common equivalent shares attributable to redeemable preferred stock........................................ - 813 - 813 ----- ----- ----- ----- Shares used in per share calculation.......................... 8,747 2,175 5,705 2,175 ===== ===== ===== ===== 1