I don't think I've actually seen exactly that from any of the virtual machine vendors. The reason, I think, is simple (assuming that the majority of virtual machines run are going to be Windows): you can't simply take an existing Windows installation and move it whole-hog onto a new machine (even onto a new virtual machine). Swapping out important components (motherboard, for example) will make the installation extremely unstable; Windows, when installed, is installed to work with the components that were there when it was installed, and moving it without a significant amount of driver prep among other things (which the MS migration tools are designed to address) will leave you with a mess.
This is amplified when you move a physical machine to a virtual machine (where you are, in effect, swapping out every hardware component).
Can you explain a bit more? – Harshal Benake – 2016-07-11T07:24:19.507