EXPIRY OF STONESOFT'S YEAR 2004 OPTION PLAN

STONESOFT CORPORATION STOCK EXCHANGE ANNOUNCEMENT 27 DECEMBER 2010 AT 3:30 P.M. Stonesoft Corporation's year 2004 Option Plan subscription period of shares will expire December 31, 2010 for all the stock options. www.stonesoft.com/en/investor_relations/shares/option_plans/ option_plan_2004.html Stonesoft Corporation Ilkka Hiidenheimo CEO More information: Ilkka Hiidenheimo, CEO Tel. +358(0)9 476 711 Email: ilkka.hiidenheimo@stonesoft.com Distribution: NASDAQ OMX Helsinki Ltd www.stonesoft.com This announcement is distributed by Thomson Reuters on behalf of Thomson Reuters clients. The owner of this announcement warrants that: (i) the releases contained herein are protected by copyright and other applicable laws; and (ii) they are solely responsible for the content, accuracy and originality of the information contained therein. Source: Stonesoft Oyj via Thomson Reuters ONE [HUG#1475698]