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Windows 7

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Title: Windows 7  
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Collection: 2009 Software, Ia-32 Operating Systems, Windows 7, X86-64 Operating Systems
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Windows 7

Windows 7
A version of the Windows NT operating system
Screenshot of Windows 7, showing its desktop, taskbar, Start menu and the glass effect of Windows Aero
Developer Microsoft
Source model Closed source / Shared source
Released to
22 July 2009 (2009-07-22)
22 October 2009 (2009-10-22)[1]
Latest release Service Pack 1 (6.1.7601)[2][3] / 22 February 2011 (2011-02-22)[4]
Update method Windows Update
Platforms IA-32 and x86-64
Kernel type Hybrid
License Proprietary commercial software
Preceded by Windows Vista (2007)[5]
Succeeded by Windows 8 (2012)
Support status
Mainstream support ended on 13 January 2015.[6][7]
Extended support ends on 14 January 2020.[6][7]

Windows 7 (codenamed Vienna, formerly Blackcomb[8]) is a personal computer operating system developed by Microsoft. It is a part of the Windows NT family of operating systems. Windows 7 was released to manufacturing on 22 July 2009,[9] and became generally available on 22 October 2009,[10] less than three years after the release of its predecessor, Windows Vista. Windows 7's server counterpart, Windows Server 2008 R2, was released at the same time.

Windows 7 was primarily intended to be an incremental upgrade to the operating system, intending to address Windows Vista's critical reception (such as performance improvements), while maintaining hardware and software compatibility. Windows 7 continued improvements on Windows Aero (the user interface introduced in Windows Vista) with the addition of a redesigned taskbar that allows applications to be "pinned" to it, and new window management features. Other new features were added to the operating system, including libraries, the new file sharing system HomeGroup, and support for multitouch input. A new "Action Center" interface was also added to provide an overview of system security and maintenance information, and tweaks were made to the User Account Control system to make it less intrusive. Windows 7 also shipped with updated versions of several stock applications, including Internet Explorer 8, Windows Media Player, and Windows Media Center.

In contrast to Windows Vista, Windows 7 was generally praised by critics, who considered the operating system to be a major improvement over its predecessor due to its increased performance, its more intuitive interface (with particular praise devoted to the new taskbar), fewer User Account Control popups, and other improvements made across the platform. Windows 7 was a major success for Microsoft; even prior to its official release, pre-order sales for 7 on the online retailer had surpassed the previous records. In just six months, over 100 million copies had been sold worldwide, increasing to over 630 million licenses by July 2012, and a market share of 56.53% of "desktop operating systems" as of September 2015[11] according to Net Applications, making it the most widely used version of Windows.


  • Development history 1
  • Features 2
    • New and changed 2.1
    • Removed 2.2
  • Editions 3
  • System requirements 4
  • Extent of hardware support 5
    • Physical memory 5.1
    • Processor limits 5.2
  • Updates 6
    • Service Pack 1 6.1
    • Windows Management Framework 3.0 6.2
    • Platform Update 6.3
    • Windows update cleanup 6.4
  • Reception 7
    • Critical reception 7.1
    • Sales 7.2
    • Antitrust concerns 7.3
  • References 8
  • External links 9
  • Further reading 10

Development history

Originally, a version of Windows codenamed Blackcomb was planned as the successor to Windows XP and Windows Server 2003 in 2000. Major features were planned for Blackcomb, including an emphasis on searching and querying data and an advanced storage system named WinFS to enable such scenarios. However, an interim, minor release, codenamed "Longhorn," was announced for 2003, delaying the development of Blackcomb.[12] By the middle of 2003, however, Longhorn had acquired some of the features originally intended for Blackcomb. After three major viruses, the Blaster, Sober, and Sobig worms, exploited flaws in Windows operating systems within a short time period in 2003, Microsoft changed its development priorities, putting some of Longhorn's major development work on hold while developing new service packs for Windows XP and Windows Server 2003. Development of Longhorn (Windows Vista) was also restarted, and thus delayed, in August 2004. A number of features were cut from Longhorn.[13] Blackcomb was renamed Vienna in early 2006.[14]

When released, Windows Vista was criticized for its

  • Ed Bott, Carl Siechert, Craig Stinson (2010). Windows 7 Inside Out. Redmond, WA:  

Further reading

  • Official website
  • The Windows 7 Blog for Developers
  • The Windows 7 Team Blog – Windows Team Blog

External links

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  55. ^ "Screenshots from a blogger with Windows 7 M1". 
  56. ^ "How to add Mac-like RAW image support to Windows 7, Vista, XP". 21 October 2009. 
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  62. ^ "Windows Virtual PC". Microsoft. Retrieved 6 May 2009. 
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  64. ^ Demonstration: Windows 7 VHD Boot. Microsoft. Retrieved 29 April 2009. 
  65. ^ "Windows 7 Presentation Virtualization: Graphics Remoting (RDP) Today and Tomorrow". Microsoft. Retrieved 2008. 
  66. ^ "Let’s talk about Windows 7 Starter". Windows Team Blog. Microsoft. 29 May 2009. Retrieved 29 May 2009. 
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  95. ^ Any optical drive that can read DVD-ROM media.
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As with the previous version of Windows, an N version, which does not come with Windows Media Player, has been released in Europe, but only for sale directly from Microsoft sales websites and selected others.[157]

In order to comply with European antitrust regulations, Microsoft proposed the use of a "ballot" screen containing download links to competing web browsers, thus removing the need for a version of Windows completely without Internet Explorer, as previously planned.[155] In response to criticism involving Windows 7 E and concerns from manufacturers about possible consumer confusion if a version of Windows 7 with Internet Explorer were shipped later after one without Internet Explorer, Microsoft announced that it would discard the separate version for Europe and ship the standard upgrade and full packages worldwide.[156]

As with other Microsoft operating systems, Windows 7 is being studied by United States federal regulators who oversee the company's operations following the 2001 United States v. Microsoft settlement. According to status reports filed, the three-member panel began assessing prototypes of the new operating system in February 2008. Michael Gartenberg, an analyst at Jupiter Research said that, "[Microsoft's] challenge for Windows 7 will be how can they continue to add features that consumers will want that also don't run afoul of regulators."[154]

Antitrust concerns

On 4 March 2010, Microsoft announced that it had sold more than 90 million Windows 7 licenses.[143] By 23 April 2010, Windows 7 had sold more than 100 million copies in six months, which made it Microsoft's fastest-selling operating-system.[144][145] As of 23 June 2010, Windows 7 has sold 150 million copies which made it the fastest selling operating system in history with seven copies sold every second.[145][146] Based on worldwide data taken during June 2010 from Windows Update 46% of Windows 7 PCs run the 64-bit edition of Windows 7.[147] According to Stephen Baker of the NPD Group during April 2010 in the United States 77% of PCs sold at retail were pre-installed with the 64-bit edition of Windows 7.[147][148] As of 22 July 2010, Windows 7 had sold 175 million copies.[149] On 21 October 2010, Microsoft announced that more than 240 million copies of Windows 7 had been sold.[150] Three months later, on 27 January 2011, Microsoft announced total sales of 300 million copies of Windows 7.[151] On 12 July 2011, the sales figure was refined to over 400 million end-user licenses and business installations.[152] As of 9 July 2012, over 630 million licenses have been sold; this number includes licenses sold to OEMs for new PCs.[153]

In July 2009, in only eight hours, pre-orders of Windows 7 at surpassed the demand which Windows Vista had had in its first 17 weeks.[135] It became the highest-grossing pre-order in Amazon's history, surpassing sales of the previous record holder, the seventh Harry Potter book.[136] After 36 hours, 64-bit versions of Windows 7 Professional and Ultimate editions sold out in Japan.[137] Two weeks after its release its market share had surpassed that of Snow Leopard, released two months previously as the most recent update to Apple's Mac OS X operating system.[138][139] According to Net Applications, Windows 7 reached a 4% market share in less than three weeks; in comparison, it took Windows Vista seven months to reach the same mark.[140][141]) As of February 2014, Windows 7 has a market share of 47.49% according to Net Applications; in comparison, Windows XP had a market share of 29.23%.[142]


The changes to User Account Control on Windows 7 were criticized for being potentially insecure, as an exploit was discovered allowing untrusted software to be launched with elevated privileges by exploiting a trusted component. Peter Bright of Ars Technica argued that "the way that the Windows 7 UAC 'improvements' have been made completely exempts Microsoft's developers from having to do that work themselves. With Windows 7, it's one rule for Redmond, another one for everyone else."[133] Microsoft's Windows kernel engineer Mark Russinovich acknowledged the problem, but noted that malware can also compromise a system when users agree to a prompt.[79][134]

Some Windows Vista Ultimate users have expressed concerns over Windows 7 pricing and upgrade options.[129][130] Windows Vista Ultimate users wanting to upgrade from Windows Vista to Windows 7 must either pay $219.99[131] to upgrade to Windows 7 Ultimate or perform a clean install, which requires them to reinstall all of their programs.[132]

Windows 7 received critical acclaim, with critics noting the increased usability and functionality when compared to its predecessor, Windows Vista. CNET gave Windows 7 Home Premium a rating of 4.5 out of 5 stars,[117] stating that it "is more than what Vista should have been, [and] it's where Microsoft needed to go". PC Magazine rated it a 4 out of 5 saying that Windows 7 is a "big improvement" over Windows Vista, with fewer compatibility problems, a retooled taskbar, simpler home networking and faster start-up.[118] Maximum PC gave Windows 7 a rating of 9 out of 10 and called Windows 7 a "massive leap forward" in usability and security, and praised the new Taskbar as "worth the price of admission alone".[119] PC World called Windows 7 a "worthy successor" to Windows XP and said that speed benchmarks showed Windows 7 to be slightly faster than Windows Vista.[120] PC World also named Windows 7 one of the best products of the year.[121] In its review of Windows 7, Engadget said that Microsoft had taken a "strong step forward" with Windows 7 and reported that speed is one of Windows 7's major selling points – particularly for the netbook sets.[122] Laptop Magazine gave Windows 7 a rating of 4 out of 5 stars and said that Windows 7 makes computing more intuitive, offered better overall performance including a "modest to dramatic" increase in battery life on laptop computers.[123] TechRadar gave Windows 7 a rating of 5 out of 5 stars, concluding that "it combines the security and architectural improvements of Windows Vista with better performance than XP can deliver on today's hardware. No version of Windows is ever perfect, but Windows 7 really is the best release of Windows yet."[124] The New York Times,[125] USA Today,[126] The Wall Street Journal,[127] and The Telegraph[128] also gave Windows 7 favorable reviews.

Critical reception


In October 2013 a Disk Cleanup Wizard addon was released that lets users delete outdated Windows updates on Windows 7 SP1, thus reducing the size of the WinSxS directory. This update backports some features found in Windows 8.[116]

Windows update cleanup

It includes enhancements to Direct2D, DirectWrite, Direct3D, Windows Imaging Component (WIC), Windows Advanced Rasterization Platform (WARP), Windows Animation Manager (WAM), XPS Document API, H.264 Video Decoder and JPEG XR decoder.[112] However support for Direct3D 11.1 is limited as the update does not include DXGI/WDDM 1.2 from Windows 8, making unavailable many related APIs and significant features such as stereoscopic frame buffer, feature level 11_1 and optional features for level 11_0.[115]

Platform Update for Windows 7 SP1 and Windows Server 2008 R2 SP1 was released on 26 February 2013[112] after a pre-release version had been released on 5 November 2012.[113] It is also included with Internet Explorer 10 for Windows 7.[114]

Platform Update

Windows Management Framework 3.0 is an update package that includes updated versions Windows PowerShell (v3.0), Windows Management Instrumentation (WMI) and Windows Remote Management (WinRM). It was released on 3 December 2012.[111]

Windows Management Framework 3.0

In Europe, the automatic nature of the feature was dropped in Windows 7 Service Pack 1 in February 2011 and remained absent for 14 months despite Microsoft reporting that it was still present, subsequently described by Microsoft as a "technical error". As a result, in March 2013 the European Commission fined Microsoft €561 million to deter companies from reneging on settlement promises.[110]

Some programs have compatibility issues with SP1 and some programs may experience a loss of functionality.[109]

Windows 7 Service Pack 1 adds support for Advanced Vector Extensions (AVX), a 256-bit instruction set extension for processors, and improves IKEv2 by adding additional identification fields such as E-mail ID to it. In addition, it adds support for Advanced Format 512e as well as additional Identity Federation Services.[107][108] Windows 7 Service Pack 1 also resolves a bug related to HDMI audio and another related to printing XPS documents.[107]

Windows 7 Service Pack 1 (SP1) was announced on 18 March 2010. A beta was released on 12 July 2010.[101][102][103] The final version was released to the public on 22 February 2011.[104] At the time of release, it was not made mandatory. It was available via Windows Update, direct download, or by ordering the Windows 7 SP1 DVD.[105] The service pack is on a much smaller scale than those released for previous versions of Windows, particularly Windows Vista.[106]

Service Pack 1


Physical processors with either multiple cores, or hyper-threading, or both, implement more than one logical processor per physical processor. A logical processor is either: 1) One of the two handlers of threads of instructions of one of the cores of one of the physical processors with support for hyper-threading present and enabled; or 2) one of the cores of one physical processors without hyper-threading. The x86 editions of Windows 7 support up to 32 logical processors, x64 editions support up to 256 (4 x 64).[100]

Windows 7 Professional and up supports up to 2 physical processors (CPU sockets).[98] Windows 7 Starter, Home Basic and Home Premium editions support only 1.[99]

Processor limits

Physical memory limits of Windows 7
Edition Processor architecture
IA-32 (32-bit) x64 (64-bit)
Ultimate 4 GB 192 GB
Home Premium 16 GB
Home Basic 8 GB
Starter 2 GB N/A

The maximum amount of RAM that Windows 7 supports varies depending on the product edition and on the processor architecture, as shown in the following table.[97]

Physical memory

Extent of hardware support

  • Windows XP Mode (Professional, Ultimate and Enterprise): Requires an additional 1 GB of RAM and additional 15 GB of available hard disk space. The requirement for a processor capable of hardware virtualization has been lifted.[96]
  • Windows Media Center (included in Home Premium, Professional, Ultimate and Enterprise), requires a TV tuner to receive and record TV.

Additional requirements to use certain features:[94]

Minimum hardware requirements for Windows 7[94]
Component Operating system architecture
32-bit 64-bit
Processor 1 GHz IA-32 processor 1 GHz x86-64 processor
Memory (RAM) 1 GB 2 GB
Graphics card DirectX 9 graphics processor with WDDM driver model 1.0
Free hard drive space 16 GB 20 GB
Optical drive DVD-ROM drive[95] (Only to install from DVD-ROM media)

System requirements

Microsoft ended the sale of new retail copies of Windows 7 in October 2014, and the sale of new OEM licenses for Windows 7 Home Basic, Home Premium, and Ultimate ended on 31 October 2014. Professional will remain available to OEMs indefinitely, primarily as part of downgrade rights for Windows 8 licenses. Microsoft has stated that it would provide one years' notice before it discontinues OEM sales of Windows 7 Professional, however.[92][93]

All editions aside from Starter support both IA-32 and x86-64 architectures; Starter only supports 32-bit systems.[84] Retail copies of Windows 7 are distributed on two DVDs: one for the IA-32 version and the other for x86-64. OEM copies include one DVD, depending on the processor architecture licensed. The installation media for consumer versions of Windows 7 are identical; the product key and corresponding license determines the edition that is installed. The Windows Anytime Upgrade service can be used to purchase an upgrade that unlocks the functionality of a higher edition, such as going from Starter to Home Premium, and Home Premium to Ultimate.[82] Most copies of Windows 7 only contained one license; in certain markets, a "Family Pack" version of Windows 7 Home Premium was also released for a limited time, which allowed upgrades on up to three computers.[90] In certain regions, copies of Windows 7 were only sold in, and could only be activated in a designated region.[91]

The remaining three editions were not available at retail, of which two were available exclusively through OEM channels as pre-loaded software. The Starter edition is a stripped-down version of Windows 7 meant for low-cost devices such as netbooks. In comparison to Home Premium, Starter has reduced multimedia functionality, does not allow users to change their desktop wallpaper or theme, disables the "Aero Glass" theme, and does not have support for multiple monitors.[84][86] Home Basic was sold only in emerging markets, and was positioned in between Home Premium and Starter.[83][82] The highest edition, Enterprise, is functionally similar to Ultimate, but is only sold through volume licensing via Microsoft's Software Assurance program.[87][88][89]

Windows 7 is available in six different editions, of which the Home Premium, Professional, and Ultimate were available at retail in most countries, and as pre-loaded software on new computers. Home Premium and Professional were aimed at home users and small businesses respectively, while Ultimate was aimed at enthusiasts. Each edition of Windows 7 includes all of the capabilities and features of the edition below it, and add additional features oriented towards their market segments; for example, Professional adds additional networking and security features such as Encrypting File System and the ability to join a domain. Ultimate contained a superset of the features from Home Premium and Professional, along with other advanced features oriented towards power users, such as BitLocker drive encryption; unlike Windows Vista, there were no "Ultimate Extras" add-ons created for Windows 7 Ultimate.[82][83][84] Retail copies were available in "upgrade" and higher-cost "full" version licenses; "upgrade" licenses require an existing version of Windows to install, while "full" licenses can be installed on computers with no existing operating system.[85]


Certain capabilities and programs that were a part of Windows Vista are no longer present or have been changed, resulting in the removal of certain functionalities. These include the classic Start Menu user interface, some taskbar features, Windows Explorer features, Windows Media Player features, Windows Ultimate Extras, Search button and InkBall. Four applications bundled with Windows Vista — Windows Photo Gallery, Windows Movie Maker, Windows Calendar and Windows Mail — are not included with Windows 7, and were replaced by Windows Live-branded versions as part of the Windows Live Essentials suite.[80][81]


For developers, Windows 7 includes a new networking API with support for building SOAP-based web services in native code (as opposed to .NET-based WCF web services),[77] new features to simplify development of installation packages and shorten application install times.[78] Windows 7, by default, generates fewer User Account Control (UAC) prompts because it allows digitally signed Windows components to gain elevated privileges without a prompt. Additionally, users can now adjust the level at which UAC operates using a sliding scale.[79]

Windows 7 includes improved globalization support through a new Extended Linguistic Services API[72] to provide multilingual support (particularly in Ultimate and Enterprise editions). Microsoft has also implemented better support for solid-state drives,[73] including the new TRIM command, and Windows 7 is able to identify a solid-state drive uniquely. Native support for USB 3.0 is not included due to delays in the finalization of the standard.[74] At WinHEC 2008 Microsoft announced that color depths of 30-bit and 48-bit would be supported in Windows 7 along with the wide color gamut scRGB (which for HDMI 1.3 can be converted and output as xvYCC). The video modes supported in Windows 7 are 16-bit sRGB, 24-bit sRGB, 30-bit sRGB, 30-bit with extended color gamut sRGB, and 48-bit scRGB.[75][76]

A new system known as "Libraries" was added for file management; users can aggregate files from multiple folders into a "Library". By default, libraries for categories such as Documents, Pictures, Music, and Video are created, consisting of the user's personal folder and the Public folder for each. The system is also used as part of a new home networking system known as HomeGroup; devices are added to the network with a password, and files and folders can be shared with all other devices in the HomeGroup, or with specific users. The default libraries, along with printers, are shared by default, but the personal folder is set to read-only access by other users, and the Public folder can be accessed by anyone.[70][71]

Windows 7 includes 13 additional sound schemes, titled Afternoon, Calligraphy, Characters, Cityscape, Delta, Festival, Garden, Heritage, Landscape, Quirky, Raga, Savanna, and Sonata.[60] Internet Spades, Internet Backgammon and Internet Checkers, which were removed from Windows Vista, were restored in Windows 7. Users are able to disable or customize many more Windows components than was possible in Windows Vista. New additions to this list of components include Internet Explorer 8, Windows Media Player 12, Windows Media Center, Windows Search, and Windows Gadget Platform.[61] A new version of Microsoft Virtual PC, newly renamed as Windows Virtual PC was made available for Windows 7 Professional, Enterprise, and Ultimate editions.[62] It allows multiple Windows environments, including Windows XP Mode, to run on the same machine. Windows XP Mode runs Windows XP in a virtual machine, and displays applications within separate windows on the Windows 7 desktop.[63] Furthermore, Windows 7 supports the mounting of a virtual hard disk (VHD) as a normal data storage, and the bootloader delivered with Windows 7 can boot the Windows system from a VHD; however, this ability is only available in the Enterprise and Ultimate editions.[64] The Remote Desktop Protocol (RDP) of Windows 7 is also enhanced to support real-time multimedia application including video playback and 3D games, thus allowing use of DirectX 10 in remote desktop environments.[65] The three application limit, previously present in the Windows Vista and Windows XP Starter Editions, has been removed from Windows 7.[66] All editions include some new and improved features that originated with Vista, such as Windows Search, Security features, and some features new to Windows 7. Optional BitLocker Drive Encryption is included with Windows 7 Ultimate and Enterprise. Windows Defender is included; Microsoft Security Essentials antivirus software is a free download. All editions include Shadow Copy, which—every day or so—System Restore uses to take an automatic "previous version" snapshot of user files that have changed.[67] Backup and restore have also been improved,[68][69] and the Windows Recovery Environment—installed by default—replaces the optional Recovery Console of Windows XP.

When the Action Center flag is clicked on, it lists all security and maintenance issues in a small popup window
Action Center, which replaces Windows Security Center in Windows XP and Vista

Window management in Windows 7 has several new features: Snap maximizes a window when it is dragged to the top of the screen.[59] Dragging windows to the left or right edges of the screen allows users to snap software windows to either side of the screen, such that the windows vertically take up half the screen. When a user moves windows that were snapped or maximized using Snap, the system restores their previous state. Snap functions can also be triggered with keyboard shortcuts. Shake hides all inactive windows when the active window's title bar is dragged back and forth rapidly (metaphorically shaken).

The taskbar has seen the biggest visual changes, where the old Quick Launch toolbar has been replaced with the ability to pin applications to taskbar. Buttons for pinned applications are integrated with the task buttons. These buttons also enable Jump Lists to allow easy access to common tasks.[57] The revamped taskbar also allows the reordering of taskbar buttons. To the far right of the system clock is a small rectangular button that serves as the Show desktop icon. By default, hovering over this button makes all visible windows transparent for a quick look at the desktop. In touch-enabled displays such as touch screens, tablet PCs, etc., this button is slightly (8 pixels) wider in order to accommodate being pressed by a finger.[58] Clicking this button minimizes all windows, and clicking it a second time restores them.

The default taskbar of Windows 7.

Among Windows 7's new features are advances in touch and handwriting recognition,[42] support for virtual hard disks,[43] improved performance on multi-core processors,[44][45][46][47] improved boot performance, DirectAccess, and kernel improvements. Windows 7 adds support for systems using multiple heterogeneous graphics cards from different vendors (Heterogeneous Multi-adapter),[48] a new version of Windows Media Center,[49] a Gadget for Windows Media Center, improved media features, XPS Essentials Pack[50] and Windows PowerShell[51] being included, and a redesigned Calculator with multiline capabilities including Programmer and Statistics modes along with unit conversion for length, weight, temperature, and several others.[52] Many new items have been added to the Control Panel, including ClearType Text Tuner[53] Display Color Calibration Wizard,[54] Gadgets, Recovery, Troubleshooting, Workspaces Center, Location and Other Sensors, Credential Manager, Biometric Devices, System Icons, and Display.[55] Windows Security Center has been renamed to Windows Action Center (Windows Health Center and Windows Solution Center in earlier builds), which encompasses both security and maintenance of the computer. ReadyBoost on 32-bit editions now supports up to 256 gigabytes of extra allocation. Windows 7 also supports images in RAW image format through the addition of Windows Imaging Component-enabled image decoders, which enables raw image thumbnails, previewing and metadata display in Windows Explorer, plus full-size viewing and slideshows in Windows Photo Viewer and Windows Media Center.[56]

Windows 7 live thumbnails

New and changed


The release candidate, build 7100, became available for MSDN and TechNet subscribers and Connect Program participants on 30 April 2009. On 5 May 2009 it became available to the general public, although it had also been leaked onto the Internet via BitTorrent.[39] The release candidate was available in five languages and expired on 1 June 2010, with shutdowns every two hours starting 1 March 2010.[40] Microsoft stated that Windows 7 would be released to the general public on 22 October 2009. Microsoft released Windows 7 to MSDN and Technet subscribers on 6 August 2009, at 10:00 am PDT.[41] Microsoft announced that Windows 7, along with Windows Server 2008 R2, was released to manufacturing on 22 July 2009. Windows 7 RTM is build 7600.16385.090713-1255, which was compiled on 13 July 2009, and was declared the final RTM build after passing all Microsoft's tests internally.[9]

At PDC 2008, Microsoft demonstrated Windows 7 with its reworked taskbar.[31] On 27 December 2008, the Windows 7 Beta was leaked onto the Internet via BitTorrent.[32] According to a performance test by ZDNet,[33] Windows 7 Beta beat both Windows XP and Vista in several key areas; including boot and shutdown time and working with files, such as loading documents. Other areas did not beat XP; including PC Pro benchmarks for typical office activities and video editing, which remain identical to Vista and slower than XP.[34] On 7 January 2009, the x64 version of the Windows 7 Beta (build 7000) was leaked onto the web, with some torrents being infected with a trojan.[35][36] At CES 2009, Microsoft CEO Steve Ballmer announced the Windows 7 Beta, build 7000, had been made available for download to MSDN and TechNet subscribers in the format of an ISO image.[37] The Beta was to be publicly released 9 January 2009, and Microsoft initially planned for the download to be made available to 2.5 million people on this date. However, access to the downloads was delayed because of high traffic.[38] The download limit was also extended, initially until 24 January, then again to 10 February. People who did not complete downloading the beta had two extra days to complete the download. After 12 February, unfinished downloads became unable to complete. Users could still obtain product keys from Microsoft to activate their copies of Windows 7 Beta, which expired on 1 August 2009.

In October 2008, it was announced that Windows 7 would also be the official name of the operating system.[25][26] There has been some confusion over naming the product Windows 7,[27] while versioning it as 6.1 to indicate its similar build to Vista and increase compatibility with applications that only check major version numbers, similar to Windows 2000 and Windows XP both having 5.x version numbers.[28] The first external release to select Microsoft partners came in January 2008 with Milestone 1, build 6519.[29] Speaking about Windows 7 on 16 October 2008, Microsoft CEO Steve Ballmer confirmed compatibility between Windows Vista and Windows 7, indicating that Windows 7 would be a refined version of Windows Vista.[30]


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