Microsoft Virtual Server is a virtualization solution that facilitates the creation of virtual machines on the Windows XP and Windows Server 2003 operating systems. Originally developed by Connectix, it was acquired by Microsoft prior to release. Virtual PC is Microsoft's related desktop virtualization software package.
Virtual machines are created and managed through an IIS web-based interface or through a Windows client application tool called VMRCplus.
The current version is Microsoft Virtual Server 2005 R2 SP1. New features in R2 SP1 include Linux guest operating system support, Virtual Disk Precompactor, SMP (but not for the Guest OS), x64 Host OS support (but not Guest OS support), the ability to mount virtual hard drives on the host OS and additional operating systems including Windows Vista. It also provides a Volume Shadow Copy writer which enables live backups of the Guest OS on a Windows Server 2003 or Windows Server 2008 Host.
Although Virtual Server 2005 R2 can run on hosts with x64 processors, it cannot run guests that require x64 processors (guests cannot be 64-bit).
It also makes use of SMP, but does not virtualize it (it does not currently allow guests to use more than 1 CPU).
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