It's mainly due to the lack of human resources (e.g. engineers, testers, PMs, and etc.) You have to understand that the Hyper-V was a extremely team (less than

It's mainly due to the lack of human resources (e.g. engineers, testers, PMs, and etc.) You have to understand that the Hyper-V was a extremely team (less than 100 people) during the Win7 time frame. At the time, the team's #1 priority was to make a product that is competitive to VMWare on the enterprise level. Therea re additional issues and overhead associated with porting Hyper-V to the client SKU's. And they simply did not have the time or the resource to do so. Now, they are able to bring Hyper-V to Win8 (the client SKUs) since they have a bigger team and more resources at their disposal.