What is Hyper-V? Hyper-V, previously codenamed Viridian, is a hypervisor-based technology that is a key feature of Windows Server 2008. It provides a scalable, reliable, and highly available virtualization platform. It is part of Microsoft's ongoing effort to provide our customers and partners with the best operating system platform for virtualization.
	What is Windows hypervisor? A core component of Hyper-V, Windows hypervisor is a thin layer of software between the hardware and the OS that allows multiple operating systems to run, unmodified, on a host computer at the same time. It provides simple partitioning functionality and is responsible for maintaining strong isolation between partitions. It has an inherently secure architecture with minimal attack surface, as it does not contain any third-party device drivers What benefits does Hyper-V offer to you as a customer?  Hyper-V provides customers an ideal platform for key virtualization scenarios, such as production server consolidation, business continuity management, software test and development, and development of a dynamic datacenter. Hyper-V provides key functionality, which an ideal virtualization platform should provide—scalability, high performance, reliability, security, flexibility, and manageability.  Hyper-V provides key functionality, which an ideal virtualization platform should provide—scalability, high performance, reliability, security, flexibility, and manageability.
	What are the system requirements for Hyper-V? In addition to the systems requirement for Windows Server 2008, the two key requirements for the Hyper-V platform are the need to ensure that the server is a 64-bit environment and supports hardware-assisted virtualization (Intel VT or AMD-V) technology. How many virtual machines can run per Processor? The number of virtual machines running per host depends on many factors, including physical memory, processor, and workload running in the guest. With Hyper-V, you define the amount of memory available to a virtual machine, and that memory allocation can be altered to reflect the needs of the virtual machine. Does Hyper-V support 64-bit processors? Hyper-V runs on a 64-bit (x64) server platform and requires support of either AMD64 or Intel IA-32e/EM64T (x64) processors with hardware-assisted virtualization support. Note that Hyper-V does not support Itanium (IA-64) processors. For the virtual machines, Hyper-V supports both 32-bit and 64-bit systems as guest OSes.
	Microsoft Homepage for Hyper-V Server 2008 http://www.microsoft.com/windowsserver2008/en/us/hyperv.aspx