No cheap Vista for Desktop Virtualization?

I just got a pointer to this litte know fact (at least I did not know it) from the VMware site:

Microsoft Virtualization Licensing and Distribution Terms - VMware: "Restrictions on Virtualization and Vista:

Microsoft has recently announced a prohibition on virtualizing the less expensive versions of Vista (Vista Home Basic and Vista Home Premium). Microsoft’s explanation has been that virtualization is not broadly usable by consumers or other mass market users, and therefore should be restricted only to the more expensive versions of Vista"

This means that you cannot use a cheaper version of Vista for desktop virtualization (VDI) ...

And this in return means, that Microsoft is afraid of VDI. That simple.