By 2007 , the preferred platform for the purchase of security software had become the `` appliance '' , according to IDC , who estimate that by 2008 , 80 % of network security products will be delivered via an appliance . By 2007 , the preferred platform for the purchase of security software had become the `` computer appliance '' , according to IDC , who estimate that by 2008 , 80 % of network security products will be delivered via an appliance .