The Microsoft Corporation recently declared that the Oil and Natural Gas Corporation Ltd. (ONGC) has emerged as its largest Windows Vista customer in Asia, with a deployment of over 18,000 units. ONGC chose to implement Windows Vista due to its advanced security features, expected productivity benefits, search functionality and lower TCO (Total Cost of Ownership). Vista implementation reduced security threats by over 50 per cent on their Laptops. Specific features that ONGC expects to leverage include the security attributes built into Internet Explorer 7 (IE7) like Phishing Filters and Protected Mode; the User Account Control (UAC) functionality; optimized deployment capabilities across thousands of machines and the Green IT features including power management and energy saving. To ensure a smooth transition and maximum returns, ONGC has also conducted company-wide trainings for employees. Microsoft claims to have sold over 180 million licenses of Windows Vista worldwide, with India adoption alone crossing over two million copies.