Avast has suspended its outsourced tech support contract pending an investigation. Avast says it will work with iYogi to determine whether the service can be re-launched. The ‘freemium’ business model has seen the free version of its antivirus client become the world’s most popular single antivirus program; Microsoft’s Security Essentials (MSE), also free, is at number two globally and number one in the US market. The revelation has prompted Avast – which last December announced a $200 million US IPO – to suspend its contract.”]