Virtualization has come to be the hot pick for consolidating and cutting hardware costs. All those machines within machines raise questions about the safety of what's inside, though, and according to a recent study, some are seriously lacking in good answers. The analysts at Gartner have been pondering virtualization lately, with particular emphasis on how migration affects security. According to their research, that effect is considerable: They estimate that some sixty percent of virtual servers are less secure than the original boxes.