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Beside Hyper-V by Windows Server2008 and2012 there are many many others option like : VMware , Oracle VM , VNC and Logme in ....ect and also if you want to know more and more about this topic by Microsoft you can read a book "Windows Server2008 Hyper-V" by John Kelbley, Mike Sterling and Allen Stewart.
Yes, Apart from VMware VSphere there are3 most common windows based Hypervisor which are Windows Server2008, Windows Server2012, Citrix XenServer though Oracle VM is not most commonly used platform.
List of complete Virtualization platform comparision
http://en.wikipedia.org/wiki/Comparison_of_platform_virtualization_software
Beside Hyper V offered by Microsoft, you have hypervisors from VMware vSphere and Citrix XenServer. Even Oracle has a hypervisor product known as Oracle VM.