 Microsoft 's announcement of its own AV software on 18 November 2008 was met with mixed reactions from the AV industry . Symantec , McAfee and Kaspersky Lab — three competing independent software vendors — dismissed it as an unworthy competitor , but AVG Technologies and Avast Software appreciated its potential to expand the consumers ' choice of AV software . AVG , McAfee , Sophos and Trend Micro claimed that the integration of the product into Microsoft Windows would be a violation of competition law . 
