 On 29 September 2010 , a year after its initial release , Microsoft announced that MSE had more than 30 million users . The Security Industry Market Share Analysis report of June 2011 , published by OPSWAT , describes it as one of the most popular AV products in the world , with 10 @.@ 66 percent of the global market and 15 @.@ 68 percent of the North American market . The same report shows Microsoft as the number one AV vendor in North America with 17 @.@ 07 percent market share , and the number four AV vendor worldwide . 
