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As noted above - KVM/libvirt with virt-manager (or gnome-boxes for a simpler tool) will read and write to any of the standard virtual disk formats (Virtualbox, VMware, the Windows product whose name I forget, and others) that you might be trying to reuse - all you need to know prior to starting is the 'virtual' hardware the virtualised OS is expecting to find; how much RAM, how many CPUs, networks, etc.

If the virtualised OS is Linux based, then it probably won't care, however, if it is a Windows OS you might need to get the right virtual hardware devices defined before it will boot successfully. I have done this successfully on a number of occasions, usually RAM and CPUs are enough to get you running. It is possible to add VirtIO based drivers to the Windows OS as well, boosting performance of the virtualised OS.

For most users, the functionality of KVM is as good as Virtualbox, and performance should be better, particularly if the VirtIO drivers are in use.