In the latest version of Oracle VirtualBox it looks like they went the extra distance and trumped all other virtualization platforms by adding the ability to impersonate each one of them. You read that correctly, the latest VirtualBox can now save a virtual machine in any of the most popular formats including,
VDI – Sun / Oracle VirtualBox
VMDK – VMWare Workstation, Server, ESX, ESXi
VHD – Microsoft Virtual PC, Hyper-V
HDD – Parallels Desktop
This is very interesting stuff, My next test will be to see if it will load all of these formats from their native applications.