One of the areas where VMware vSphere has had a large advantage over Microsoft Hyper-V has been in the architecture and capabilities of the VMware vSphere Virtual Switch. The most important of these capabilities has been the ability to designate one or more ports on the switch as promiscuous or mirror ports. These ports make a read only copy of all of the data flowing through the switch available to whatever virtual machine is sitting on that port. This is an essential capability for many security products and also performance management solutions like those from ExtraHop Networks that rely upon deep packet inspection to work.
Windows Server 8 and Hyper-V 3 may blow up the entire rationale for EMC owning VMware. Cheap storage for virtualization enabled by new Microsoft features will force VMware to embrace cheap storage as well. This will precipitate the commoditization of the storage market, and accelerate the pace of virtualization and cloud computing.