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 Ley-land, 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 vendorssuch 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 billionby 2015.5