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POPSVirtualization - Sun's many flavors I think Sun has something interesting here. A huge x86 server (I think the biggest they have is an 8 socket, 4cores AMD box = 32 cores) running Solaris (of OpenSolaris) apps at full speed, running on Solaris containers for different users, and running other OSs on each container with virtualbox, on a CIA/DHS/DOD level secure environment.