I had a Windows 10 Pro (OEM) installation running as a guest on a Xenserver 6.5 host. The host has crashed and I copied the VHD file directly from the host to another host running Virtualbox. I was able to boot with no problems, but Windows now reports that it is not activated. I called Microsoft's activation line, but they imply that the product key is invalid and won't assist in reactivation.
Is there anything I can do to re-activate the machine as a Virtualbox guest? It would be a huge amount of work to try and rebuild the Xen server and move everything back to it.
Thanks for any advice.