Windows Virtual PC

Windows Virtual PC
This article is about the virtualization software by Microsoft. For the generic term, see Virtual machine.
Windows Virtual PC
Virtual pc icon.png
Windows virtual pc.png
Windows Virtual PC running Windows XP Mode on a Windows 7 host
Developer(s) Microsoft
Initial release September 19, 2009 (2009-September-19)[1]
Stable release 6.1.7600.16393 / February 10, 2011; 9 months ago (2011-February-10)[2]
Operating system Windows 7 - All editions except Starter[3]
Size 32-bit: 9.1 MB
64-bit: 9.9 MB[1]
Type Virtual machine
License Proprietary[3]
Website microsoft.com/windows/virtualpc/

Windows Virtual PC (successor to Microsoft Virtual PC 2007, Microsoft Virtual PC 2004, and Connectix Virtual PC) is a virtualization program for Microsoft Windows. In July 2006 Microsoft released the Windows-hosted version as a free product.[4] In August 2006 Microsoft announced the Macintosh-hosted version would not be ported to Intel-based Macintosh computers, effectively discontinuing the product as PowerPC-based Macintosh computers are no longer manufactured. The newest release, Windows Virtual PC, does not run on versions of Windows earlier than Windows 7, and does not officially run MS-DOS or operating systems earlier than Windows XP SP3 Professional.[3] The older versions, which support a wider range of host and guest operating systems, remain available.

Virtual PC virtualizes a standard PC and its associated hardware. Supported Windows operating systems can run inside Virtual PC. Other operating systems such as Linux may run, but are not officially supported, and Microsoft does not provide the necessary drivers (called "Virtual Machine Additions") for Linux.[5]

Contents

History

Connectix Virtual PC, Microsoft Virtual PC 2004, Microsoft Virtual PC 2007, and Windows Virtual PC are successive versions of the same software. Windows Virtual PC runs only under Windows 7 and is only designed to run operating systems from XP Professional on, but the earlier Microsoft versions which run under older versions of Windows are still available, and can run operating systems older than Windows XP.

Virtual PC by Connectix

Connectix Virtual PC version 3 in Mac OS 9, running a Brazilian Portuguese edition of Windows 95

Virtual PC was originally developed for the Macintosh and released by Connectix in June 1997. The first version of Virtual PC designed for Windows-based systems, version 4.0, was released in June 2001. Connectix sold versions of Virtual PC bundled with a variety of guest operating systems, including Windows, OS/2, and Red Hat Linux. As virtualization's importance to enterprise users became clear, Microsoft took interest in the sector and acquired Virtual PC and Virtual Server (unreleased at the time) from Connectix in February 2003.

Earlier versions of Virtual PC supported the following features: (now removed in Microsoft Virtual PC 2004, 2007, and Windows Virtual PC):

  • Older versions of Virtual PC (v5.0 or earlier) may have the hard disk formatted after creating the Virtual Hard Disk file. Newer versions must partition and format the Virtual Hard Disk file manually.
  • A Virtual Switch available in Virtual PC version 4.1 or earlier allows adding multiple network adapters.
  • Older operating systems are supported with Virtual Machine additions.
  • Older versions of Virtual PC for Macintosh can run on Mac OS 9.2.2 or earlier. Support of Apple System 7.5 are dropped in version 3.

Under agreement with Connectix, Innotek GmbH (makers of VirtualBox, now part of Sun Microsystems which is itself owned by Oracle) ported version 5.0 to run on an OS/2 host.[6] This version also included guest extensions (VM additions) for OS/2 guests, which could run on Windows, OS/2 or Mac OS X hosts using Virtual PC versions 5, 6 or 7. A new version of the guest extensions was later included with Microsoft's Virtual PC 2004.

Microsoft Virtual PC

Virtual PC 6.1 for Macintosh

On July 12, 2006, Microsoft released Virtual PC 2004 SP1 for Windows free of charge, but the Mac version was not made free. The equivalent version for Mac, version 7, was the final version of Virtual PC for Mac. It ran on Mac OS X 10.2.8 or later for PowerPC and was a Proprietary commercial software product.[7]

Virtual PC 2007 was released only for the Windows platform, with public beta testing beginning October 11, 2006, and production release on February 19, 2007. It added support for hardware virtualization, viewing virtual machines on multiple monitors and support for Windows Vista as both host and guest. (The Windows Aero interface is disabled on Windows Vista guests due to limitations of the emulated video hardware; however, Aero effects can be rendered by connecting to the guest via Remote Desktop Connection from an Aero-enabled Vista host.)[8]

On May 15, 2008, Microsoft released Virtual PC 2007 Service Pack 1, which added support for both Windows XP SP3 and Vista SP1 as guest and host OSes, as well as Windows Server 2008 Standard as a guest OS.[9][10] A hotfix rollup for Virtual PC 2007 SP1, released February 20, 2009, solved networking issues and enhanced the maximum screen resolution to 2048×1920 (32-bit),[11] enabling 16:9 resolutions such as 1920×1080. A security update was released on 14 July 2009 to address an elevation of privilege vulnerability in guest operating systems.[12]

Release dates of Microsoft Virtual PC 2007
Date Version Description
2006-10-11 6.0.122 Beta
2007-01-02 6.0.142 Release Candidate 1
2007-02-22 6.0.156 Release to Manufacturing
2008-05-15 6.0.192 Service Pack 1[13]
2009-02-20 6.0.210 Update[14]
2009-07-14 N/A Security Update MS09-33[15]

Windows Virtual PC

Windows Virtual PC entered public beta testing on April 30, 2009,[16] and was released alongside Windows 7.[17] Unlike its predecessors, this version supports only Windows 7 host operating systems.[3] It originally required hardware virtualization support but on March 19, 2010, Microsoft released an update to Microsoft Virtual PC which allows it to run on PCs without hardware support.[2]

Windows Virtual PC is available free of charge for certain editions of Windows 7,[3] either pre-installed by OEMs or via download from the Microsoft website.[1]

New features[18]

  • USB support and redirection – connect peripherals such as flash drives and digital cameras, and print from the guest to host OS printers. However, USB isochronous transfer mode is not supported [19]
  • Seamless application publishing and launching – run Windows XP Mode applications directly from the Windows 7 desktop
  • Support for multithreading – run multiple virtual machines concurrently, each in its own thread for improved stability and performance
  • Smart card redirection – use smart cards connected to the host
  • Integration with Windows Explorer – manage all VMs from a single Explorer folder (%USER%\Virtual Machines)

Removed features

  • The Virtual Machine console is replaced by an integrated Virtual Machines shell folder. Several options from the console have been removed such as Restore at start, CPU time performance settings, muting sound in inactive virtual machines, full-screen resolution related options, configuring the host key, mouse capture options and settings for requiring administrator permissions.[20]
  • Official guest support for operating systems earlier than Windows XP Professional
  • Drag-and-drop file sharing between the guest and the host[21]
  • Direct sharing of folders between host and guest operating system (Only volumes may be shared between operating systems)[22]
  • Ability to commit changes in undo disks upon turning off virtual machines (Doing so is now only possible through virtual machine Settings dialog box)[23]
  • Ability to use physical and virtual Parallel ports[24]
  • User interface controls for using virtual floppy disks (Virtual floppy disk functionality, however, is still supported and may be accessed using a script)[25]
  • Virtual PC additions for guest operating systems no longer supported have been removed. However, installing Virtual Machine Additions from an older Microsoft virtualization product works for some guest OSes.[26][27][28]
  • Properties of the Virtual Machine like Guest OS, processor, processor features, video mode, Video RAM, code cache, IDE controller reads and writes, ethernet reads and writes, video frame rate and command line options can no longer be viewed.[citation needed]

System requirements

System requirements for Windows Virtual PC:[29][30]

  • Computer running Windows 7 (all editions except Starter)
  • 1+ GHz processor (32- or 64-bit)
  • 1.25 GB memory required, 2 GB recommended
  • Additional 15 GB of hard disk space per virtual Windows environment recommended
  • Optional: if the processor supports hardware-assisted virtualization technology such as AMD-V or Intel-VT, it will be used. Before March 19, 2010, such a processor was mandatory.

Windows XP Mode

Internet Explorer versions 6, 7, and 8 run concurrently on a Windows 7 Release Candidate desktop using Windows XP Mode.

Windows XP Mode (XPM)[31] is a virtual machine package for Windows Virtual PC containing a pre-installed, licensed copy of Windows XP Professional with Service Pack 3 as its guest OS. Previously, both the CPU and motherboard of the host had to support hardware virtualization,[5] but an update in early 2010 eliminated this requirement.[32] Pre-installed integration components allow applications running within the virtualized environment to appear as if running directly on the host,[17][33] sharing the native desktop and Start Menu of Windows 7 as well as participating in file type associations. Windows XP Mode applications run in a Terminal Services session in the virtualized Windows XP, and are accessed via Remote Desktop Protocol by a client running on the Windows 7 host.[34][35]

Applications running in Windows XP Mode do not have compatibility issues, as they are actually running inside a Windows XP virtual machine and redirected using RDP to the Windows 7 host. For 64-bit editions of Windows 7, XP Mode may be used to run 16-bit applications; it includes NTVDM.

Windows XP Mode is available free of charge to users of Windows 7 Professional, Enterprise, and Ultimate.[30] Users of other editions of Windows 7 are not eligible to download and use it.[32][36] This restriction does not apply to Windows Virtual PC itself.

Windows XP Mode can also be run with the VMware Player and VMware Workstation. However, VMware products only import Windows XP Mode on Windows 7 Professional, Enterprise, or Ultimate to adhere with Microsoft licensing requirements.[37]

Emulated environment

Virtual PC emulates the following environments:[38]

  • Intel Pentium II (32-bit) processor (but virtualizes the host processor on Windows versions) with an Intel 440BX chipset.
  • Standard SVGA VESA graphics card (S3 Trio 32 PCI with 4 MB video RAM, adjustable in later versions up to 16 MB by manually editing a virtual machine's settings file).
  • System BIOS from American Megatrends (AMI).
  • Creative Labs Sound Blaster 16 ISA PnP. (When Vista is installed as both the host (main) and guest (virtual) operating systems, settings are synchronized with the host and audio configuration is not required.)
  • DEC 21041 (DEC 21140 in newer versions) Ethernet network card.
  • Microsoft Virtual PC 2007 and earlier do not have the ability to redirect USB devices to the guest machine, although devices connected to the host OS via USB can be used as normal by Virtual PC[clarification needed].
  • Programs using undocumented features of hardware, exotic timings, or unsupported opcodes may not work.

Implementation:

  • The Macintosh version of Virtual PC uses dynamic recompilation to translate the x86 code used by PCs into equivalent PowerPC code for Macs.
  • The Windows version of Virtual PC also uses dynamic recompilation, but only to translate x86 kernel mode and real mode code into x86 user mode code; original user mode and virtual 8086 mode code run natively.
  • Guest call traps are used, especially for guest extensions, to accelerate emulation or offer additional features, such as integration with the host environment.
  • Virtual PC and Virtual Server encapsulate virtual hard disks in the Virtual Hard Disk (VHD) file format, for which Microsoft has made all documentation available under the Open Specification Promise.

Earlier versions of Virtual PC supported the following features: (now removed in Microsoft Virtual PC 2004, 2007, and Windows Virtual PC):

  • Older versions of Virtual PC (v5.0 or earlier) may have the hard disk formatted after creating the Virtual Hard Disk file. Newer versions must partition and format the Virtual Hard Disk file manually.
  • A Virtual Switch available in Virtual PC version 4.1 or earlier allows adding multiple network adapters.
  • Older operating systems are supported with Virtual Machine additions.
  • Older versions of Virtual PC for Macintosh can run on Mac OS 9.2.2 or earlier. Support of Apple System 7.5 was dropped in version 3.

Virtual machine integration components

Windows Virtual PC may enable guest operating systems running inside virtual machines to interact with their host operating system beyond what is feasible between two physical computers, such as sharing physical hardware components or exchanging data. To do so however, integration components must be installed on the guest operating systems. When no integration component is installed, the only mean of communicating between two machines (either virtual or physical) is through a virtual network interface. Even the mouse cursor can only be controlled by one operating system (either real or virtual) at any given time. However, once the Integration Components are installed on the guest operating systems, the following features are automatically activated:[39]

  • Mouse cursor sharing: Mouse cursor can be move freely between the machines.
  • Host-initiated shutdown: Virtual machine can be shut down, restarted or put into standby or hibernation via a set of API functions.
  • Time synchronization: The virtual machine's clock will be automatically synchronized with the host operating system's clock.
  • Process responsiveness monitoring: Host operating system will be able to detect whether the software on the guest operating system is responsive or hung.
  • Dynamic screen resolution: The screen resolution of the guest operating system can simply be changed by resizing the window into which it is running.

In addition to features described above, guest operating systems may also take advantage of the following integration features but only when the administrator activates them:[39]

  • Audio sharing: Audio played on the guest operating system may be brought to the host operating system and played on it.
  • Clipboard sharing: Contents such as text, picture or everything that is cut or copied to Windows Clipboard maybe pasted in other machines.
  • Printer sharing: Guest operating systems may print on the host operating system's printer . This feature should not be confused with File and Printer Sharing over an emulated network connection.
  • Smart card sharing: Smart cards connected to host operating system may be accessed on guest operating systems.
  • File sharing: Windows Virtual PC can also share disk partitions and disk drives of the host operating system with guest operating systems.[21][22] This includes USB mass storage devices that are connected later.[40]

In Windows Virtual PC, enabling integration features automatically makes the virtual machine user account accessible using Remote Desktop Connection.[39]

Supported host and guest operating systems

Virtual PC allows multiple guest operating systems to run virtualized on a single physical host. Although a number of popular host and guest operating systems lack official Microsoft support, there are sometimes few, if any, technical obstacles impeding installation. Instead, a configuration may be unsupported due to Microsoft's own licensing restrictions,[41][42] or a decision to focus testing and support resources elsewhere, especially when production use of a legacy product fades.[43][44]

A program manager on Microsoft's core virtualization team explains what official support entails:

With each release of Virtual PC we spend a significant amount of time trying to decide which (guest) operating system should be officially supported. While Virtual PC is capable of running many operating systems, official support for an operating system means that we will test it thoroughly, not ship Virtual PC if an issue exists with that operating system, and provide full support for customers who encounter problems while running these operating systems under Virtual PC.[43]
—Ben Armstrong, "Virtual PC Guy"

As a product positioned for desktop use, Virtual PC provides official support for a different set of operating systems than its server-oriented counterpart, Microsoft Virtual Server and the more advanced Hyper-V.[45][46] While the latter products support a range of server operating systems,[47][48] Virtual PC 2007 supports only one variety as host and another as guest;[49] its successor, Windows Virtual PC, supports none.[50] And, whereas Virtual Server and Hyper-V have officially supported select Linux guests since 2006[51] and 2008,[52] respectively, as of 2009, no Microsoft release of Virtual PC has officially supported Linux. Nonetheless, a number of Linux distributions[52] do run successfully in Virtual PC 2007, and can be used with the Virtual Machine Additions from Virtual Server (see below).[53][54] Lastly, while 64-bit host support was introduced with Virtual PC 2007, no release has been able to virtualize a 64-bit guest;[55][56][57] Microsoft has thus far reserved this functionality for Hyper-V, which runs only on 64-bit (x64) editions of Windows Server 2008.[47][58]

Table of supported operating systems

In the following table and notes, "support" refers to official Microsoft support, as described above.

Virtual PC 2004
[59][60][46][61][62]		 Virtual PC 2007
[49][63][64]		 Windows Virtual PC
[50][65][66][67]
Operating system (host or guest?) Host Guest Host Guest Host Guest
32-bit 64-bit 32-bit 32-bit 64-bit 32-bit 32-bit 64-bit 32-bit 64-bit
Windows 7 Ultimate No No No No[δ] No[δ] No[δ] Yes Yes Yes No
Windows 7 Enterprise No No No No[δ] No[δ] No[δ] Yes Yes Yes No
Windows 7 Professional No No No No[δ] No[δ] No[δ] Yes Yes Yes No
Windows 7 Home Premium No No No No No No Yes[I] Yes[I] Yes[J] No
Windows 7 Home Basic No No No No No No Yes[I] Yes[I] Yes[J] No
Windows 7 Starter No N/A No No N/A No No N/A No[J] N/A
Windows Server 2008 Standard No No No No No Yes[E] No No No No
Windows Vista Ultimate No No No Yes Yes Yes[D][G] No No Yes No
Windows Vista Enterprise No No No Yes Yes Yes[D][G] No No Yes No
Windows Vista Business No No No Yes Yes Yes[D][G] No No Yes No
Windows Vista Home Premium No No No Yes[H] Yes[H] Yes[D][F] No No No[J] No
Windows Vista Home Basic No No No Yes[H] Yes[H] Yes[F] No No No[J] No
Windows Vista Starter No N/A No No N/A Yes No N/A No[J] N/A
Windows Server 2003 Standard Yes[B] No Yes Yes Yes Yes No No No No
Windows XP Professional Yes No Yes Yes Yes Yes No No Yes No
Windows XP Tablet PC Edition Yes N/A Yes Yes N/A Yes No N/A No[J] N/A
Windows XP Media Center Edition No N/A No[γ] No N/A No No N/A No[J] N/A
Windows XP Home Edition No N/A Yes Yes[H] N/A Yes[H] No N/A No[J] N/A
Windows XP Starter Edition No N/A Yes No N/A Yes No N/A No[J] N/A
Windows 2000 Server No N/A Yes No N/A Yes No N/A No N/A
Windows 2000 Professional Yes N/A Yes No N/A Yes No N/A No N/A
Windows Me No N/A Yes No N/A No[C] No N/A No N/A
Windows 98 Second Edition No N/A Yes No N/A Yes No N/A No N/A
Windows 98 (original release) No N/A Yes No N/A No[C] No N/A No N/A
Windows 95 No N/A Yes No N/A No[C][β] No N/A No N/A
Windows NT 4.0 Workstation No N/A Yes No N/A No[C] No N/A No N/A
Windows NT 3.51 Workstation No N/A No No N/A No No N/A No N/A
Windows NT 3.1 | NT 3.5 No N/A No[ε] No N/A No[ε] No N/A No N/A
IBM OS/2 (select editions) No N/A Yes[A] No N/A Yes[A] No N/A No N/A
16-bit 16-bit 16-bit 16-bit 16-bit 16-bit
Windows 3.1 No No[68] No No No No N/A
Windows 3.0 No No No No[C][α] No No N/A
MS-DOS 6.22 No Yes No No[C][α] No No N/A
LEGEND
Microsoft support
Yes Supported
No Not supported
N/A Version nonexistent

Notes – Details of Microsoft support

  1. 1 2 Supported editions: OS/2 Warp Version 4 Fix Pack 15, OS/2 Warp Convenience Pack 1, and OS/2 Warp Convenience Pack 2.[49][59][63]
  2. 1 Support added in Virtual PC 2004 Service Pack 1 (SP1) for Windows Server 2003, Standard Edition as a host.[60]
  3. 1 2 3 4 5 For Virtual PC 2007, Microsoft designated the following legacy operating systems "compatible", but discontinued official support: MS-DOS 6.22, Windows NT 4.0 Workstation, Windows 95, the original release of Windows 98 and Windows Me.[49][63]
  4. 1 2 3 4 For Windows Vista guests in Virtual PC 2007, the Windows Aero graphical user interface is disabled due to limitations of the emulated S3 Trio[69] graphics card; the interface falls back to the Vista Home Basic theme. However, Aero effects can be rendered by connecting to the guest via Remote Desktop Connection from an Aero-enabled host.[8][70]
  5. 1 Support added in Virtual PC 2007 Service Pack 1 (SP1) for Windows Server 2008 Standard as a guest.[49]
  6. 1 2 Microsoft's January 2008 EULA supplement[42][71] for Windows Vista lifted restrictions[72][73] barring installation of Vista Home Basic and Home Premium as guest operating systems.[41][74][75][76]
  7. 1 2 3 Microsoft's January 2008 EULA supplement[42][71] for Windows Vista lifted restrictions[73] barring use of BitLocker[77][78][79] and Microsoft-DRM-protected content within virtualized environments.[41][76][80]
  8. 1 2 3 4 5 6 Support added in a Virtual PC 2007 Service Pack 1 (SP1) hotfix rollup, dated February 20, 2009, for Windows XP Home as both host and guest, and for all Home editions of Windows Vista as hosts.[64]
  9. 1 2 3 4 The pre-configured XP Mode of Windows Virtual PC is restricted to Windows 7 Professional, Enterprise, and Ultimate hosts.[65] However, an equivalent environment can be configured manually by installing Windows XP SP3 as a guest (requires an XP license and installation media or files) and applying an integration components update (available for download[81] from Microsoft) to enable seamless mode and other Windows 7 integration features.[82]
  10. ^ The integration components enabling seamless mode and other features[82] of Windows Virtual PC support only the following guests: Windows XP Pro Service Pack 3 (SP3);[81] Windows Vista Business SP1, Enterprise SP1, and Ultimate SP1;[83] and Windows 7 Professional, Enterprise, and Ultimate.[50][65]

Notes – Not supported installations

  1. 1 Virtual PC 2007 does not include Virtual Machine Additions for MS-DOS as a self installing disk image (installed using a batch file), however the files are included in the Virtual Machine Additions ISO image file (typically found in the 'Program Files' folder where Virtual PC was installed) and can be extracted by various means (a number of file compression software packages support extracting files from ISO image files) for manual installation, also the DOS additions from Virtual PC 2004 can be used without problem as can the DOS additions from Virtual Server 2005.[44]
  2. 1 The Virtual Machine Additions included with Virtual PC 2007 will not install on Windows 95 guests, but the additions from Virtual PC 2004 can be used.[43]
  3. 1 In informal testing, Microsoft virtualization manager Ben Armstrong found XP Media Center 2004 "distorted and unusable" under Virtual PC 2004, but Media Center 2005 worked "beautifully", sans TV features.[84]
  4. 1 2 3 MSDN blogs report that pre-release versions of Windows 7, similar to the forthcoming Ultimate edition,[85][dated info] run successfully as both host and guest operating systems on Virtual PC 2007 Service Pack 1 (SP1). Integration features provided by Virtual Machine Additions function normally, but Virtual PC 2007 must be SP1 or later.[86][87][88] See "Windows 7 on Virtual PC on Windows 7" [86] for more caveats.
  5. 1 2 Although Windows NT 3.1 and NT 3.5 refuse to install on newer processors (NT 3.51 fixes this), it is possible to modify files on the install CD to allow install.

Linux guests

Installing a Linux-based guest environment in Virtual PC is possible. RedHat and SuSe Linux guests are supported. Linux additions are supported in Microsoft Virtual Server, and these additions should also work in Virtual PC.[53]

Some Linux distributions must be installed in text mode, as they do not support Microsoft Virtual PC's emulated graphics chip. Ubuntu 8.10 (Intrepid Ibex) must be installed in SafeMode, but does not require other changes.

Some websites specialize in listing operating systems that run successfully as Virtual PC guests, to help users avoid issues when installing Linux distributions or other operating systems lacking official Microsoft support.[89]

Intel-based Mac support

Microsoft announced on August 7, 2006, that Virtual PC for Mac would not be ported to the Intel Mac platform. Microsoft stated, "Alternative solutions offered by Apple and other vendors, combined with a fully packaged retail copy of Windows, will satisfy this need."[90] Similar products available at the time were Parallels Desktop and VMware Fusion.

See also

About Microsoft virtualization technology
About virtualization
About notable virtualization products

References

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  2. ^ a b "Windows Virtual PC". Microsoft Download Center. Microsoft corporation. March 17, 2010. http://www.microsoft.com/downloads/en/details.aspx?FamilyID=2b6d5c18-1441-47ea-8309-2545b08e11dd. Retrieved February 2, 2011. 
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  4. ^ "Virtual PC is free!". July 12, 2006. http://blogs.msdn.com/virtual_pc_guy/archive/2006/07/12/662535.aspx. Retrieved 14 October 2009. 
  5. ^ a b Thefreecountry: Free PC/Intel x86 Emulators and Virtual Machines
  6. ^ Innotek/Connectix Virtual PC
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  9. ^ Microsoft releases Virtual PC 2007 SP1
  10. ^ "Virtual PC 2007 SP1 Release Notes". Microsoft. 2008-05-15. http://www.microsoft.com/downloads/details.aspx?FamilyID=9f3d3eb5-5e03-4712-999c-e96f91bdf128&displaylang=en. Retrieved 2009-06-28. 
  11. ^ KB958162
  12. ^ MS09-033
  13. ^ "Download details: Microsoft Virtual PC 2007 SP1". Microsoft Download Center. Microsoft Corporation. May 5, 2005. http://www.microsoft.com/downloads/en/details.aspx?familyid=28C97D22-6EB8-4A09-A7F7-F6C7A1F000B5&displaylang=en. Retrieved April 1, 2011. 
  14. ^ "Description of the hotfix rollup package for Virtual PC 2007 Service Pack 1: February 20, 2009 (Revision: 1.2)". Microsoft Support. Microsoft Corporation. February 20, 2009. http://support.microsoft.com/kb/958162. Retrieved April 1, 2011. 
  15. ^ "Vulnerability in Virtual PC and Virtual Server Could Allow Elevation of Privilege (969856)". Microsoft TechNet. Microsoft Corporation. July 14, 2009. http://www.microsoft.com/technet/security/bulletin/MS09-033.mspx. Retrieved April 1, 2011. 
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  19. ^ Selling Windows 7 to the Enterprise: Microsoft Switzerland Technology Specialist presentation
  20. ^ Are Windows Virtual PC "Options" Still available ?
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  26. ^ Installing DOS additions under VPC 2007
  27. ^ Installing Windows 98 on Windows Virtual PC
  28. ^ Using Virtual PC 2004 Additions to Enhance the Windows 2000 Guest Experience on Windows Virtual PC
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  33. ^ Secret No More: Revealing Windows XP Mode for Windows 7 - SuperSite Blog
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