Microsoft introduced Hyper-V as a Virtualization platform in 2008, and it continued to release new Hyper-V versions with new Windows server versions. So far, there are a total of four versions, including Windows Server 2012 R2, Windows Server 2012, Windows Server 2008 R2 and Windows Server 2008.
Since Hyper-V’s debut, it has always been a Windows Server feature, which could be installed whenever a server administrator decided to do so. It’s also available as a separate product called Microsoft Hyper-V Server. Basically, Microsoft Hyper-V Server is a standalone and shortened version of Windows Server where Microsoft cut out everything irrelevant to virtualization, services and Graphical User Interface (GUI) to make the server as small as possible.