AWS is a service provider. I specifically said mid to large enterprise segment. Since IDC tends not to give their reports away the only thing "public" I can f

AWS is a service provider. I specifically said mid to large enterprise segment. Since IDC tends not to give their reports away the only thing "public" I can find in a quick search: http://www.bobsguide.com/guide/news/2014/Apr/4/server-virtualization-continues-to-grow-in-emea-but-mega-datacenters-are-changing-the-game.html http://www.bobsguide.com/guide/news/2014/Apr/4/server-virtua... As for my anecdote: out of the 20 fortune 500 companies I work with, the Xen/KVM market share is literally under 1%. Not a single deployed instance beyond a couple corner cases of Citrix for small VDI workloads. There are a few looking at openstack, but they're still science experiments at this point, and not their production enterprise deployments.