Cloud computing users range from individuals and small businesses to Fortune 500 firms and governments. According to a September 2008 survey from the Pew Research Institute, nearly 69 percentof Americans use cloud computing services (such as webmail and on-line data backup sites).3 In India,companies such as Ashok Leyland, Tata Elxi, Bharti, Infosys,Asian Paints, and Maruti are either piloting or using cloud computing . Additionally, nearly 1,500 companies in India already use blended (voice-chat-data) cloud based communication services from vendors such as Cisco WebEx and Microsoft.4 The US government projects that between 2010 and 2015, its spending on cloud computing will be at approximately a 40 percent compound annual growth rate (CAGR) and will pass $7 billion by 2015.5