I could imagine that being problematic for large corporations that have long software upgrade cycles (for instance, because it takes them two years to certify that everything they need runs on the new OS and then another year and a half to develop an image to use for the new OS on all machines in the organization, and then another year to polish the upgrade process.) What are they supposed to do when old desktops break down and they need to replace the hardware?<p>I assume that the new hardware will still run old operating systems under virtualization?