Microsoft Virtual Server was a virtualization solution that facilitated the creation of virtual machines on the Windows XP, Windows Vista 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 a Web-based interface that relies on Internet Information Services (IIS) or through a Windows client application tool called VMRCplus.
The last version using this name was 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 operating system support, the ability to mount virtual hard drives on the host machine and additional operating systems support, including Windows Vista. It also provides a Volume Shadow Copy writer that enables live backups of the Guest OS on a Windows Server 2003 or Windows Server 2008 host. A utility to mount has also been included since SP1. Virtual Machine Additions for Linux are available as a free download. Officially supported Linux guest operating systems include Red Hat Enterprise Linux versions 2.1-5.0, Red Hat Linux 9.0, SUSE Linux and SUSE Linux Enterprise Server versions 9 and 10.
Virtual Server has been discontinued and replaced by Hyper-V.
VPC has multimedia support and Virtual Server does not (e.g. no sound driver support).
VPC uses a single thread whereas Virtual Server is multi-threaded.
VPC will install on Windows 7, but Virtual Server is restricted from install on NT 6.1 or higher operating systems i.e. Server 2008 R2 and Windows 7.
VPC is limited to 127GB .vhd (per IDE CHS specification), however Virtual Server can be made to access .vhd up to 2048GB (NTFS max file size).
Microsoft acquired an unreleased Virtual Server from Connectix in February 2003.
The initial release of Microsoft's Virtual Server, general availability, was announced on September 13, 2004.
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