 The announcement of Microsoft Security Essentials affected the stocks of AV vendors . On 19 November 2008 , after Microsoft announced codename Morro , Symantec and McAfee shares fell 9 @.@ 44 and 6 @.@ 62 percent respectively . On 10 June 2009 , after announcing an upcoming beta version , Microsoft shares rose 2 @.@ 1 percent . Symantec and McAfee shares , however , fell 0 @.@ 5 and 1 @.@ 3 percent respectively . Daniel Ives , an analyst with FBR Capital Markets , said that Microsoft Security Essentials would be a " long @-@ term competitive threat " , although near @-@ term impact would be negligible . 
