STONESOFT'S FINANCIAL REPORTS IN 2011

STONESOFT CORPORATION STOCK EXCHANGE ANNOUNCEMENT 20 DECEMBER 2010 AT 3.00 p.m. Stonesoft Corporation will release the following financial reports in 2011: - March 3, 2011 at 9.15 a.m. Financial Statements 2010 - May 6, 2011 at 9.15 a.m. Interim report January-March 2011 - August 12, 2011 at 9.15 a.m. Interim report January-June 2011 - October 21, 2011 at 9.15 a.m. Interim report January-September 2011 Press conferences for the media, analysts and investors will be held at Stonesoft main office in Helsinki, Itälahdenkatu 22 A on - March 3, 2011 at 10.30 a.m. Financial Statements 2010 - May 6, 2011 at 10.30 a.m. Interim Report January-March 2011 - August 12, 2011 at 10.30 a.m. Interim Report January-June 2011 - October 21, 2011 at 10.30 a.m. Interim Report January-September 2011 The Annual General Meeting of the Shareholders of Stonesoft Corporation will be held on April 13, 2011 at 3.00 p.m. The Annual Report will be published on week 12 at www.stonesoft.com. 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#1474170]