Cloud computing users range from individuals and small businesses to Fortune 500 firms and governments. According to a September 2008 survey from the Pew Re-search Institute, nearly 69 percent of Americans use cloud computing services (such as webmail and online 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 compa-nies in India already use blended(voice-chat-data) cloud based communication services from vendors such as Cisco WebEx and Microsoft.4 The US government projectsthat between 2010 and 2015, its spending on cloud computing willbe at approximately a 40 percent compound annual growth rate(CAGR) and will pass $7 billion by 2015.5