Gartner research indicates that at the end of 2009, only 18 percent of enterprise data center workloads that could be virtualized had been virtualized; the number is expected to grow to more than 50 percent by the close of 2012. As more workloads are virtualized, as workloads of different trust levels are combined and as virtualized workloads become more mobile, the security issues associated with virtualization become more critical to address.

http://www.gartner.com/it/page.jsp?id=1322414

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