Re: [Qemu-discuss] Migrating Windows XP vm from VirtualBox to Qemu/KVM

[Tony Su]

Although the details in the following article are a bit dated, there is good stuff here.
https://wiki.ubuntu.com/UbuntuMagazine/HowTo/Switching_From_VMWare_To_VirtualBox:_.vmdk_To_.vdi_Using_Qemu_+_VdiTool

Note that

There ia link to another article re migrating Windows Guests
That once the disk image is converted to raw, from there you often can use "as is" because it's supported nearly universally with all virtualization technologies or take the additional step to convert to a native format.

Tony