Microsoft Virtual Server is virtualization software which allows setting up a virtual private server on a Windows operating system. A WINDOWS VIRTUAL PRIVATE SERVER (windows VPS) can be used on the Windows XP, Windows Vista and Windows Server 2003 operating systems. Hosting a virtual private server can be done through these operating systems, thus setting up a windows VPS hosting system. Linux VPS services gained more popularity than window VPS services due to its user friendly interface.
NetEx Online Services Windows VPS server hosting leads the market with a wide range of Windows VPS options and features. Including Windows Server 2008 and 2003 with your choice of Microsoft Hyper-V or Parallels Virtuozzo virtualization you can get the Windows VPS hosting that suits you.
Windows Virtual Private Servers benefit from Windows VPS features including support for asp, ASP.NET and Sharepoint web pages as well as Microsoft SQL and Access databases.
Virtuozzo VPS uses Windows as the root operating system and then begins to separate into Windows VPS "instances" from there. Comparatively, Hyper-V VPS is its own root operating system. From there you install complete physical installations of Windows onto each Windows VPS.
To bring this down a notch, essentially if you want to modify your Windows installation then you need Hyper-V. Virtuozzo's limitation is that original installation is shared and virtualization happens on top.
It's this limitation however that makes Virtuozzo Windows VPS powerful. Many if not most updates you wish to make to your Virtuozzo Windows VPS can happen in real-time without rebooting your machine. This includes RAM, CPU and other upgrades!