Amazon is the dominant vendor in the cloud, according to Gartner's latest Magic Quadrant report on infrastructure-as-a-service, with CSC, Microsoft and Rackspace also in the top five. "AWS is the overwhelming market share leader, with more than five times the compute capacity in use than the aggregate total of the other fourteen providers in this Magic Quadrant," the report says, while also noting the potential for change from increasing competition.

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