STONESOFT CORPORATION STOCK EXCHANGE RELEASE DECEMBER 10, 2010 AT 11.30 AM Tekes, the Finnish Funding Agency for Technology and Innovation has decided to fund Stonesoft Corporation's research and development project "Dynamic network security" with more than one million Euros. The funding is distributed mainly during the years 2011 and 2012. The goals of the research and product development project in question are detection and prevention of new dynamic network security threats, adapting security systems to mobile networks with Internet traffic, implementing effective protection also in less critical networks and managing the ever increasing information flow in data networks. "We are very pleased with the funding decision of Tekes, because the granted funding considerably accelerates the completion of the project. We believe that this research project allows us to improve the competitiveness of our products and to offer our customers increasingly better protection against new, dynamic security threats", Ilkka Hiidenheimo, the CEO of Stonesoft. The decision of Tekes was based on, among other, the following grounds: the project has a significant impact on the business development of the company. The novelty value of the innovation strived for in the project is internationally significant, and the Tekes funding is a prerequisite for the realization of the project and its impact. The granted funding has no impact on the company's previous estimate regarding the operating result of the year 2010. For further information: Ilkka Hiidenheimo, CEO, Stonesoft Corporation Tel. (09) 476 711 E-mail: ilkka.hiidenheimo@stonesoft.com Stonesoft Corporation Ilkka Hiidenheimo, CEO Distribution: NASDAQ OMX Helsinki Ltd Main media www.stonesoft.com [HUG#1471197]