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A version of the Windows NT operating system
Developer	Microsoft
Source model
Released to manufacturing	November 8, 2006; 13 years ago (2006-11-08)[2]
General availability	January 30, 2007; 13 years ago (2007-01-30)[3]
Final release	Service Pack 2 (6.0.6002)[4] / May 26, 2009; 11 years ago (2009-05-26)[5]
Update method
Platforms	IA-32 and x86-64
Kernel type	Hybrid (NT)
License	Proprietarycommercial software
Preceded by	Windows XP (2001)
Succeeded by	Windows 7 (2009)
Official website	www.microsoft.com/windows/windows-vista/default.aspx
Support status
Mainstream support ended on April 10, 2012 Extended support ended on April 11, 2017[6]

Windows Vista is an operating system produced by Microsoft as a member of the Windows NT family of operating systems for use on personal computers. Development was completed on November 8, 2006,^[2] and over the following three months, it was released in stages to computer hardware and software manufacturers, business customers and retail channels. On January 30, 2007, it was released worldwide^[3] and was made available for purchase and download from the Windows Marketplace; it is the first release of Windows to be made available through a digital distribution platform.^[7] The release of Windows Vista came more than five years after the introduction of its predecessor, Windows XP, the longest time span between successive releases of Microsoft Windows desktop operating systems.

New features of Windows Vista include an updated graphical user interface and visual style dubbed Aero, a new search component called Windows Search, redesigned networking, audio, print and display sub-systems, and new multimedia tools such as Windows DVD Maker. Vista aimed to increase the level of communication between machines on a home network, using peer-to-peer technology to simplify sharing files and media between computers and devices. Windows Vista included version 3.0 of the .NET Framework, allowing software developers to write applications without traditional Windows APIs.

Microsoft's primary stated objective with Windows Vista was to improve the state of security in the Windows operating system.^[8] One common criticism of Windows XP and its predecessors was their commonly exploited security vulnerabilities and overall susceptibility to malware, viruses and buffer overflows. In light of this, Microsoft chairman Bill Gates announced in early 2002 a company-wide "Trustworthy Computing initiative", which aimed to incorporate security into every aspect of software development at the company.^[9] Microsoft stated that it prioritized improving the security of Windows XP and Windows Server 2003 above finishing Windows Vista, thus delaying its completion.^[10][11]

While these new features and security improvements garnered positive reviews, Vista was also the target of much criticism and negative press. Criticism of Windows Vista targeted its high system requirements, its more restrictive licensing terms, the inclusion of a number of then-new DRM technologies aimed at restricting the copying of protected digital media, lack of compatibility with some pre-Vista hardware and software, longer boot time, and the number of authorization prompts for User Account Control. As a result of these and other issues, Windows Vista saw initial adoption and satisfaction rates lower than Windows XP.^[12] However, Vista usage had surpassed Microsoft's pre-launch two-year-out expectations of achieving 200 million users, with an estimated 330 million Internet users in January 2009.^[13][14]

At the release of its successor, Windows 7 (October 2009), Windows Vista (with approximately 400 million Internet users) was the second most widely used operating system on the Internet with an approximately 19% market share, the most widely used being Windows XP with an approximately 63% market share.^[15] In May 2010, Windows Vista's market share had an estimated range from 15% to 26%.^[16][17] On October 22, 2010, Microsoft ceased sales of retail copies of Windows Vista, and the OEM sales for Vista ceased a year later.^[18]

Mainstream support for Vista ended on April 10, 2012,^[19] and extended support ended on April 11, 2017.^[20] As of August 2020^[update], Vista's market share has declined to 0.42% of Windows' total market share (0.32% of all traditional PCs).^[21]

Development[edit]

Microsoft began work on Windows Vista, known at the time by its codename "Longhorn", in May 2001,^[22] five months before the release of Windows XP. It was originally expected to ship in late 2003 as a minor step between Windows XP and "Blackcomb", which was planned to be the company's next major operating system release (which would eventually be released as Windows 7). Gradually, "Longhorn" assimilated many of the important new features and technologies slated for Blackcomb, resulting in the release date being pushed back several times in three years. In some builds of Longhorn, their license agreement said "For the Microsoft product codenamed 'Whistler'". Many of Microsoft's developers were also re-tasked to build updates to Windows XP and Windows Server 2003 to strengthen security. Faced with ongoing delays and concerns about feature creep, Microsoft announced on August 27, 2004, that it had revised its plans. For this reason, Longhorn was reset to start work on componentizing the Windows Server 2003 Service Pack 1 codebase, and over time re-incorporating the features that would be intended for an actual operating system release. However, some previously announced features such as WinFS were dropped or postponed, and a new software development methodology called the Security Development Lifecycle was incorporated to address concerns with the security of the Windows codebase, which is programmed in C, C++ and assembly. Longhorn became known as Vista in 2005.^[23][24]

As Longhorn[edit]

The early development stages of Longhorn were generally characterized by incremental improvements and updates to Windows XP. During this period, Microsoft was fairly quiet about what was being worked on, as their marketing and public relations efforts were more strongly focused on Windows XP, and Windows Server 2003, which was released in April 2003. Occasional builds of Longhorn were leaked onto popular file sharing networks such as IRC, BitTorrent, eDonkey and various newsgroups, and so most of what is known about builds before the first sanctioned development release of Longhorn in May 2003 is derived from these builds.

After several months of relatively little news or activity from Microsoft with Longhorn, Microsoft released Build 4008, which had made an appearance on the Internet around February 28, 2003.^[25] It was also privately handed out to a select group of software developers. As an evolutionary release over build 3683, it contained several small improvements, including a modified blue "Plex" theme and a new, simplified Windows Image-based installer that operates in graphical mode from the outset, and completed an install of the operating system in approximately one third the time of Windows XP on the same hardware. An optional "new taskbar" was introduced that was thinner than the previous build and displayed the time differently.

The most notable visual and functional difference, however, came with Windows Explorer. The incorporation of the Plex theme made blue the dominant color of the entire application. The Windows XP-style task pane was almost completely replaced with a large horizontal pane that appeared under the toolbars. A new search interface allowed for filtering of results, searching for Windows help, and natural-language queries that would be used to integrate with WinFS. The animated search characters were also removed. The "view modes" were also replaced with a single slider that would resize the icons in real-time, in the list, thumbnail, or details mode, depending on where the slider was. File metadata was also made more visible and more easily editable, with more active encouragement to fill out missing pieces of information. Also of note was the conversion of Windows Explorer to being a .NET application.

Most builds of Longhorn and Vista were identified by a label that was always displayed in the bottom-right corner of the desktop. A typical build label would look like "Longhorn Build 3663.Lab06_N.020728-1728". Higher build numbers did not automatically mean that the latest features from every development team at Microsoft was included. Typically, a team working on a certain feature or subsystem would generate their working builds which developers would test with, and when the code was deemed stable, all the changes would be incorporated back into the main development tree at once. At Microsoft, several "Build labs" exist where the compilation of the entirety of Windows can be performed by a team. The name of the lab in which any given build originated is shown as part of the build label, and the date and time of the build follow that. Some builds (such as Beta 1 and Beta 2) only display the build label in the version information dialog (Winver). The icons used in these builds are from Windows XP.

At the Windows Hardware Engineering Conference (WinHEC) in May 2003, Microsoft gave their first public demonstrations of the new Desktop Window Manager and Aero. The demonstrations were done on a revised build 4015 which was never released. Several sessions for developers and hardware engineers at the conference focused on these new features, as well as the Next-Generation Secure Computing Base (previously known as "Palladium"), which at the time was Microsoft's proposed solution for creating a secure computing environment whereby any given component of the system could be deemed "trusted". Also at this conference, Microsoft reiterated their roadmap for delivering Longhorn, pointing to an "early 2005" release date.^[26]

Development reset[edit]

By 2004, it had become obvious to the Windows team at Microsoft that they were losing sight of what needed to be done to complete the next version of Windows and ship it to customers. Internally, some Microsoft employees were describing the Longhorn project as "another Cairo" or "Cairo.NET", referring to the Cairo development project that the company embarked on through the first half of the 1990s, which never resulted in a shipping operating system (though nearly all the technologies developed in that time did end up in Windows 95 and Windows NT^[27]). Microsoft was shocked in 2005 by Apple's release of Mac OS X Tiger. It offered only a limited subset of features planned for Longhorn, in particular fast file searching and integrated graphics and sound processing, but appeared to have impressive reliability and performance compared to contemporary Longhorn builds.^[28] Most Longhorn builds had major Explorer.exe system leaks which prevented the OS from performing well, and added more confusion to the development teams in later builds with more and more code being developed which failed to reach stability.

In a September 23, 2005 front-page article in The Wall Street Journal,^[29] Microsoft co-president Jim Allchin, who had overall responsibility for the development and delivery of Windows, explained how development of Longhorn had been "crashing into the ground" due in large part to the haphazard methods by which features were introduced and integrated into the core of the operating system, without a clear focus on an end-product. Allchin went on to explain how in December 2003, he enlisted the help of two other senior executives, Brian Valentine and Amitabh Srivastava, the former being experienced with shipping software at Microsoft, most notably Windows Server 2003,^[30] and the latter having spent his career at Microsoft researching and developing methods of producing high-quality testing systems.^[31] Srivastava employed a team of core architects to visually map out the entirety of the Windows operating system, and to proactively work towards a development process that would enforce high levels of code quality, reduce interdependencies between components, and in general, "not make things worse with Vista".^[32] Since Microsoft decided that Longhorn needed to be further componentized, work started on the Omega-13 series builds where they would componentize existing Windows Server 2003 source code, and over time add back functionality as development progressed. Future Longhorn builds would start from Windows Server 2003 Service Pack 1 and continue from there.

This change, announced internally to Microsoft employees on August 26, 2004, began in earnest in September, though it would take several more months before the new development process and build methodology would be used by all of the development teams. A number of complaints came from individual developers, and Bill Gates himself, that the new development process was going to be prohibitively difficult to work within.

As Windows Vista[edit]

By approximately November 2004, the company had considered several names for the final release, ranging from simple to fanciful and inventive. In the end, Microsoft chose Windows Vista as confirmed on July 22, 2005, believing it to be a "wonderful intersection of what the product really does, what Windows stands for, and what resonates with customers, and their needs". Group Project Manager Greg Sullivan told Paul Thurrott "You want the PC to adapt to you and help you cut through the clutter to focus on what's important to you. That's what Windows Vista is all about: "bringing clarity to your world" (a reference to the three marketing points of Vista—Clear, Connected, Confident), so you can focus on what matters to you".^[33] Microsoft co-president Jim Allchin also loved the name, saying that "Vista creates the right imagery for the new product capabilities and inspires the imagination with all the possibilities of what can be done with Windows—making people's passions come alive."^[34]

After Longhorn was named Windows Vista in July 2005, an unprecedented beta-test program was started, involving hundreds of thousands of volunteers and companies. In September of that year, Microsoft started releasing regular Community Technology Previews (CTP) to beta testers from July 2005 to February 2006. The first of these was distributed at the 2005 Microsoft Professional Developers Conference, and was subsequently released to beta testers and Microsoft Developer Network subscribers. The builds that followed incorporated most of the planned features for the final product, as well as a number of changes to the user interface, based largely on feedback from beta testers. Windows Vista was deemed feature-complete with the release of the "February CTP", released on February 22, 2006, and much of the remainder of the work between that build and the final release of the product focused on stability, performance, application and driver compatibility, and documentation. Beta 2, released in late May, was the first build to be made available to the general public through Microsoft's Customer Preview Program. It was downloaded over 5 million times. Two release candidates followed in September and October, both of which were made available to a large number of users.^[35]

At the Intel Developer Forum on March 9, 2006, Microsoft announced a change in their plans to support EFI in Windows Vista. The UEFI 2.0 specification (which replaced EFI 1.10) was not completed until early 2006, and at the time of Microsoft's announcement, no firmware manufacturers had completed a production implementation which could be used for testing. As a result, the decision was made to postpone the introduction of UEFI support to Windows; support for UEFI on 64-bit platforms was postponed until Vista Service Pack 1 and Windows Server 2008 and 32-bit UEFI would not be supported, as Microsoft did not expect many such systems to be built because the market was quickly moving to 64-bit processors.^[36][37]

While Microsoft had originally hoped to have the consumer versions of the operating system available worldwide in time for the 2006 holiday shopping season, it announced in March 2006 that the release date would be pushed back to January 2007 in order to give the company—and the hardware and software companies that Microsoft depends on for providing device drivers—additional time to prepare. Because a release to manufacturing (RTM) build is the final version of code shipped to retailers and other distributors, the purpose of a pre-RTM build is to eliminate any last "show-stopper" bugs that may prevent the code from responsibly being shipped to customers, as well as anything else that consumers may find annoying. Thus, it is unlikely that any major new features would be introduced; instead, work would focus on Vista's fit and finish. In just a few days, developers had managed to drop Vista's bug count from over 2470 on September 22 to just over 1400 by the time RC2 shipped in early October. However, they still had a way to go before Vista was ready to RTM. Microsoft's internal processes required Vista's bug count to drop to 500 or fewer before the product could go into escrow for RTM.^[38] For most of the pre-RTM builds, those 32-bit editions are only released.

On June 14, 2006, Windows developer Philip Su posted a blog entry which decried the development process of Windows Vista, stating that "The code is way too complicated, and that the pace of coding has been tremendously slowed down by overbearing process."^[39] The same post also described Windows Vista as having approximately 50 million lines of code, with about 2,000 developers working on the product. During a demonstration of the speech recognition feature new to Windows Vista at Microsoft's Financial Analyst Meeting on July 27, 2006, the software recognized the phrase "Dear mom" as "Dear aunt". After several failed attempts to correct the error, the sentence eventually became "Dear aunt, let's set so double the killer delete select all".^[40] A developer with Vista's speech recognition team later explained that there was a bug with the build of Vista that was causing the microphone gain level to be set very high, resulting in the audio being received by the speech recognition software being "incredibly distorted".^[41]

Windows Vista build 5824 (October 17, 2006) was supposed to be the RTM release, but a bug, which destroyed any system that was upgraded from Windows XP, prevented this, damaging development and lowering the chance that it would hit its January 2007 deadline.^[42]

Development of Windows Vista came to an end when Microsoft announced that it had been finalized on November 8, 2006, and was concluded by co-president of Windows development, Jim Allchin.^[43] The RTM's build number had also jumped to 6000 to reflect Vista's internal version number, NT 6.0.^[44] Jumping RTM build numbers is common practice among consumer-oriented Windows versions, like Windows 98 (build 1998), Windows 98 SE (build 2222), Windows Me (build 3000) or Windows XP (build 2600), as compared to the business-oriented versions like Windows 2000 (build 2195) or Server 2003 (build 3790). On November 16, 2006, Microsoft made the final build available to MSDN and Technet Plus subscribers.^[45] A business-oriented Enterprise edition was made available to volume license customers on November 30, 2006.^[46] Windows Vista was launched for general customer availability on January 30, 2007.

New or changed features[edit]

Windows Vista introduced several features and functionality not present in its predecessors.

End-user[edit]

• Windows Aero: The new graphical user interface is named Windows Aero, which Jim Allchin stated is an acronym for Authentic, Energetic, Reflective, and Open.^[47] Microsoft intended the new interface to be cleaner and more aesthetically pleasing than those of previous Windows versions, featuring new transparencies, live thumbnails, live icons, and animations, thus providing a new level of eye candy. Laptop users report, however, that enabling Aero shortens battery life^[48][49] and reduces performance.
• Windows shell: The new Windows shell offers a new range of organization, navigation, and search capabilities: Task panes in Windows Explorer are removed, integrating the relevant task options into the toolbar. A "Favorite links" pane has been added, enabling one-click access to common directories. A search box appears in every Explorer window. The address bar has been replaced with a breadcrumb navigation bar. Icons of certain file types in Windows Explorer are "live" and can be scaled in size up to 256 × 256 pixels. The preview pane allows users to see thumbnails of various files and view the contents of documents. The details pane shows information such as file size and type, and allows viewing and editing of embedded tags in supported file formats. The Start menu has changed as well; incorporating an instant search box, and the All Programs list uses a horizontal scroll bar instead of the cascading flyout menu seen in Windows XP. The word "Start" itself has been removed in favor of a blue orb that bears the Windows logo.
• Windows Search: A new search component of Windows Vista, it features instant search (also known as search as you type), which provides instant search results, thus finding files more quickly than the search features found in previous versions of Windows and can search the contents of recognized file types.^[50] Users can search for certain metadata such as name, extension, size, date or attributes.
• Windows Sidebar: A transparent panel, anchored to the right side of the screen, wherein a user can place Desktop Gadgets, which are small applets designed for a specialized purpose (such as displaying the weather or sports scores). Gadgets can also be placed on the desktop.^[51]
• Windows Internet Explorer 7: New user interface, tabbed browsing, RSS, a search box, improved printing,^[52] Page Zoom, Quick Tabs (thumbnails of all open tabs), Anti-Phishing filter, a number of new security protection features, Internationalized Domain Name support (IDN), and improved web standards support. IE7 in Windows Vista runs in isolation from other applications in the operating system (protected mode); exploits and malicious software are restricted from writing to any location beyond Temporary Internet Files without explicit user consent.
• Windows Media Player 11, a major revamp of Microsoft's program for playing and organizing music and video. New features in this version include word wheeling (incremental search or "search as you type"), a new GUI for the media library, photo display and organization, the ability to share music libraries over a network with other Windows Vista machines, Xbox 360 integration, and support for other Media Center Extenders.
• Windows Defender: An antispyware program with several real-time protection agents. It includes a software explorer feature, which provides access to startup programs, and allows one to view currently running software, network connected applications, and Winsock providers (Winsock LSPs).
• Backup and Restore Center: Includes a backup and restore application that gives users the ability to schedule periodic backups of files on their computer, as well as recovery from previous backups. Backups are incremental, storing only the changes made each time, minimizing disk usage. It also features Complete PC Backup (available only in the Ultimate, Business, and Enterprise editions), which backs up an entire computer as an image onto a hard disk or DVD. Complete PC Backup can automatically recreate a machine setup onto new hardware or hard disk in case of any hardware failures. Complete PC Restore can be initiated from within Windows Vista or from the Windows Vista installation CD in the event that a PC is so corrupt that it cannot start normally from the hard disk.
• Windows Mail: A replacement for Outlook Express that includes a new mail store that improves stability,^[53] and features integrated instant search. It has the Phishing Filter like Internet Explorer 7 and Junk mail filtering that is enhanced through regular updates via Windows Update.^[54]
• Windows Calendar is a new calendar and task application which integrates with Windows Contacts and Windows Mail. It is compatible with various calendar file types, such as the popular iCalendar.
• Windows Photo Gallery, a photo and movie library management application. It can import from digital cameras, tag and rate individual items, adjust colors and exposure, create and display slideshows (with pan and fade effects) through Direct3D and burn slideshows to a DVD.
• Windows DVD Maker, a companion program to Windows Movie Maker that provides the ability to create video DVDs based on a user's content. Users can design a DVD with title, menus, video, soundtrack, pan and zoom motion effects on pictures or slides.
• Windows Media Center, which was previously exclusively bundled in a separate edition of Windows XP, known as Windows XP Media Center Edition, has been incorporated into the Home Premium and Ultimate editions of Windows Vista.
• Games: Most of the standard computer games included in previous versions of Windows have been redesigned to showcase Vista's new graphical capabilities. New games available in Windows Vista are Chess Titans (3D Chess game), Mahjong Titans (3D Mahjong game), and Purble Place (a small collection of games, oriented towards younger children, including a matching game, a cake-creator game, and a dress-up puzzle game). Purble Place is the only one of the new games available in the Windows Vista Home Basic edition. InkBall is available for Home Premium (or better) users.
• Games Explorer: A new special folder called "Games" exposes installed video games and information about them. These metadata may be updated from the Internet.^[55]
• Windows Mobility Center is a control panel that centralizes the most relevant information related to mobile computing (brightness, sound, battery level / power scheme selection, wireless network, screen orientation, presentation settings, etc.).
• Windows Fax and Scan Allows computers with fax modems to send and receive fax documents, as well as scan documents. It is not available in the Home editions of Windows Vista, but is available in the Business, Enterprise and Ultimate editions.
• Windows Meeting Space replaces NetMeeting. Users can share applications (or their entire desktop) with other users on the local network, or over the Internet using peer-to-peer technology (higher editions than Starter and Home Basic can take advantage of hosting capabilities, Starter and Home Basic editions are limited to "join" mode only)
• Windows HotStart enables compatible computers to start applications directly from operating system startup or resume by the press of a button—this enables what Microsoft has described as appliance-like availability, which allows computers to function in a manner similar to a consumer electronics device such as a DVD player;^[56] the feature was also designed to provide the instant-on feature availability that is traditionally associated with mobile devices.^[57] While Microsoft has emphasized multimedia scenarios with Windows HotStart,^[58] a user can configure this feature so that a button launches a preferred application.^[59]
• Shadow Copy automatically creates daily backup copies of files and folders. Users can also create "shadow copies" by setting a System Protection Point using the System Protection tab in the System control panel. The user can view multiple versions of a file throughout a limited history and be allowed to restore, delete, or copy those versions. This feature is available only in the Business, Enterprise, and Ultimate editions of Windows Vista and is inherited from Windows Server 2003.^[60]

• Windows Update: Software and security updates have been simplified,^[61] now operating solely via a control panel instead of as a web application. Windows Mail's spam filter and Windows Defender's definitions are updated automatically via Windows Update. Users who choose the recommended setting for Automatic Updates will have the latest drivers installed and available when they add a new device.
• Parental controls: Allows administrators to monitor and restrict user activity, as well as control which websites, programs and games each Standard user can use and install. This feature is not included in the Business or Enterprise editions of Vista.
• Windows SideShow: Enables the auxiliary displays on newer laptops or on supported Windows Mobile devices. It is meant to be used to display device gadgets while the computer is on or off.
• Speech recognition is integrated into Vista.^[62] It features a redesigned user interface and configurable command-and-control commands. Unlike the Office 2003 version, which works only in Office and WordPad, Speech Recognition in Windows Vista works for any accessible application. In addition, it currently supports several languages: British and American English, Spanish, French, German, Chinese (Traditional and Simplified) and Japanese.
• New fonts, including several designed for screen reading, and improved Chinese (Yahei, JhengHei), Japanese (Meiryo), and Korean (Malgun) fonts. ClearType has also been enhanced and enabled by default.
• Improved audio controls allow the system-wide volume or volume of individual audio devices and even individual applications to be controlled separately. New audio functionalities such as room correction, bass management, speaker fill, and headphone virtualization have also been incorporated.
• Problem Reports and Solutions, a feature that allows users to check for solutions to problems or view previously sent problems for any solutions or additional information, if available.
• Windows System Assessment Tool is a tool used to benchmark system performance. Software such as games can retrieve this rating and modify its own behavior at runtime to improve performance. The benchmark tests CPU, RAM, 2-D and 3-D graphics acceleration, graphics memory and hard disk space.^[63][64]
• Windows Ultimate Extras: The Ultimate edition of Windows Vista provides, via Windows Update, access to some additional features. These are a collection of additional MUI language packs, Texas Hold 'Em (a Poker game) and Microsoft Tinker (a strategy game where the character is a robot), BitLocker and EFS enhancements that allow users to back up their encryption key online in a Digital Locker, and Windows Dreamscene, which enables the use of videos in MPEG and WMV formats as the desktop background. On April 21, 2008, Microsoft launched two more Ultimate Extras; three new Windows sound schemes, and a content pack for Dreamscene. Various DreamScene Content Packs have been released since the final version of DreamScene was released.
• Reliability and Performance Monitor includes various tools for tuning and monitoring system performance and resources activities of CPU, disks, network, memory and other resources. It shows the operations on files, the opened connections, etc.^[65]
• Disk Management: The Logical Disk Manager in Windows Vista supports shrinking and expanding volumes on-the-fly.^[66]
• Windows Anytime Upgrade: is a program that allows a user to upgrade their computer running Vista to a higher edition. For example, a computer running Windows Vista Home Basic can be upgraded to Home Premium or better. Anytime Upgrade permits users to upgrade without having their programs and data erased, and is cheaper than replacing the existing installation of Windows. Anytime Upgrade is no longer available for Vista.^[67]
• Digital Locker Assistant: A program that facilitated access to downloads and purchases from the Windows Marketplacedigital distribution platform.^[68] Apps purchased from Windows Marketplace are managed by Microsoft Account credentials, which are used to access a user's digital locker that stores the app and its associated information (e.g., licenses) off-site.^[69]

Core[edit]

Vista includes technologies such as ReadyBoost^[70] and ReadyDrive, which employ fast flash memory (located on USB flash drives and hybrid hard disk drives) to improve system performance by caching commonly used programs and data. This manifests itself in improved battery life on notebook computers as well, since a hybrid drive can be spun down when not in use.^[71] Another new technology called SuperFetch utilizes machine learning techniques to analyze usage patterns to allow Windows Vista to make intelligent decisions about what content should be present in system memory at any given time. It uses almost all the extra RAM as disk cache.^[72] In conjunction with SuperFetch, an automatic built-in Windows Disk Defragmenter makes sure that those applications are strategically positioned on the hard disk where they can be loaded into memory very quickly with the least amount of physical movement of the hard disk's read-write heads.^[73]

As part of the redesign of the networking architecture, IPv6 has been fully incorporated into the operating system^[74] and a number of performance improvements have been introduced, such as TCP window scaling.^[75] Earlier versions of Windows typically needed third-party wireless networking software to work properly, but this is not the case with Vista, which includes more comprehensive wireless networking support.^[76]

For graphics, Vista introduces a new Windows Display Driver Model^[77] and a major revision to Direct3D. The new driver model facilitates the new Desktop Window Manager, which provides the tearing-free desktop and special effects that are the cornerstones of Windows Aero. Direct3D 10, developed in conjunction with major graphics card manufacturers, is a new architecture with more advanced shader support, and allows the graphics processing unit to render more complex scenes without assistance from the CPU. It features improved load balancing between CPU and GPU and also optimizes data transfer between them.^[78] WDDM also provides video content playback that rivals typical consumer electronics devices. It does this by making it easy to connect to external monitors, providing for protected HD video playback and increasing overall video playback quality. For the first time in Windows, graphics processing unit (GPU) multitasking is possible, enabling users to run more than one GPU-intensive application simultaneously.^[79]

At the core of the operating system, many improvements have been made to the memory manager, process scheduler and I/O scheduler. The Heap Manager implements additional features such as integrity checking in order to improve robustness and defend against buffer overflow security exploits, although this comes at the price of breaking backward compatibility with some legacy applications.^[80] A Kernel Transaction Manager has been implemented that enables applications to work with the file system and Registry using atomic transaction operations.^[81]

Security-related[edit]

Improved security was a primary design goal for Vista.^[8] Microsoft's Trustworthy Computing initiative, which aims to improve public trust in its products, has had a direct effect on its development. This effort has resulted in a number of new security and safety features and an Evaluation Assurance Level rating of 4+.^[82][83]

User Account Control, or UAC is perhaps the most significant and visible of these changes. UAC is a security technology that makes it possible for users to use their computer with fewer privileges by default, with a view to stopping malware from making unauthorized changes to the system. This was often difficult in previous versions of Windows, as the previous "limited" user accounts proved too restrictive and incompatible with a large proportion of application software, and even prevented some basic operations such as looking at the calendar from the notification tray. In Windows Vista, when an action is performed that requires administrative rights (such as installing/uninstalling software or making system-wide configuration changes), the user is first prompted for an administrator name and password; in cases where the user is already an administrator, the user is still prompted to confirm the pending privileged action. Regular use of the computer such as running programs, printing, or surfing the Internet does not trigger UAC prompts. User Account Control asks for credentials in a Secure Desktop mode, in which the entire screen is dimmed, and only the authorization window is active and highlighted. The intent is to stop a malicious program misleading the user by interfering with the authorization window, and to hint to the user the importance of the prompt.^[84]

Testing by Symantec Corporation has proven the effectiveness of UAC. Symantec used over 2,000 active malware samples, consisting of backdoors, keyloggers, rootkits, mass mailers, trojan horses, spyware, adware, and various other samples. Each was executed on a default Windows Vista installation within a standard user account. UAC effectively blocked over 50 percent of each threat, excluding rootkits. 5 percent or less of the malware that evaded UAC survived a reboot.^[85][86]

Internet Explorer 7's new security and safety features include a phishing filter, IDN with anti-spoofing capabilities, and integration with system-wide parental controls. For added security, ActiveX controls are disabled by default. Also, Internet Explorer operates in a protected mode, which operates with lower permissions than the user and runs in isolation from other applications in the operating system, preventing it from accessing or modifying anything besides the Temporary Internet Files directory.^[87] Microsoft's anti-spyware product, Windows Defender, has been incorporated into Windows, providing protection against malware and other threats. Changes to various system configuration settings (such as new auto-starting applications) are blocked unless the user gives consent.

Whereas prior releases of Windows supported per-file encryption using Encrypting File System, the Enterprise and Ultimate editions of Vista include BitLocker Drive Encryption, which can protect entire volumes, notably the operating system volume. However, BitLocker requires approximately a 1.5-gigabyte partition to be permanently not encrypted and to contain system files in order for Windows to boot. In normal circumstances, the only time this partition is accessed is when the computer is booting, or when there is a Windows update that changes files in this area, which is a legitimate reason to access this section of the drive. The area can be a potential security issue, because a hexadecimal editor (such as dskprobe.exe), or malicious software running with administrator and/or kernel level privileges would be able to write to this "Ghost Partition" and allow a piece of malicious software to compromise the system, or disable the encryption. BitLocker can work in conjunction with a Trusted Platform Module (TPM) cryptoprocessor (version 1.2) embedded in a computer's motherboard, or with a USB key.^[88] However, as with other full disk encryption technologies, BitLocker is vulnerable to a cold boot attack, especially where TPM is used as a key protector without a boot PIN being required too.^[89]

A variety of other privilege-restriction techniques are also built into Vista. An example is the concept of "integrity levels" in user processes, whereby a process with a lower integrity level cannot interact with processes of a higher integrity level and cannot perform DLL–injection to a processes of a higher integrity level. The security restrictions of Windows services are more fine-grained, so that services (especially those listening on the network) have no ability to interact with parts of the operating system they do not need to. Obfuscation techniques such as address space layout randomization are used to increase the amount of effort required of malware before successful infiltration of a system. Code integrity verifies that system binaries have not been tampered with by malicious code.

As part of the redesign of the network stack, Windows Firewall has been upgraded, with new support for filtering both incoming and outgoing traffic. Advanced packet filter rules can be created that can grant or deny communications to specific services.

The 64-bit versions of Vista require that all device drivers be digitally signed, so that the creator of the driver can be identified.^[90]

System management[edit]

While much of the focus of Vista's new capabilities highlighted the new user-interface,^[91] security technologies, and improvements to the core operating system, Microsoft also adding new deployment and maintenance features:

• The Windows Imaging Format (WIM) provides the cornerstone of Microsoft's new deployment and packaging system. WIM files, which contain a HAL-independent image of Windows Vista, can be maintained and patched without having to rebuild new images. Windows Images can be delivered via Systems Management Server or Business Desktop Deployment technologies. Images can be customized and configured with applications then deployed to corporate client personal computers using little to no touch by a system administrator. ImageX is the Microsoft tool used to create and customize images.
• Windows Deployment Services replaces Remote Installation Services for deploying Vista and prior versions of Windows.
• Approximately 700 new Group Policy settings have been added, covering most aspects of the new features in the operating system, as well as significantly expanding the configurability of wireless networks, removable storage devices, and user desktop experience. Vista also introduced an XML-based format (ADMX) to display registry-based policy settings, making it easier to manage networks that span geographic locations and different languages.^[92]
• Services for UNIX, renamed as "Subsystem for UNIX-based Applications", comes with the Enterprise and Ultimate editions of Vista. Network File System (NFS) client support is also included.
• Multilingual User Interface–Unlike previous versions of Windows (which required the loading of language packs to provide local-language support), Windows Vista Ultimate and Enterprise editions support the ability to dynamically change languages based on the logged-on user's preference.
• Wireless Projector support

Developer[edit]

Windows Vista includes a large number of new application programming interfaces. Chief among them is the inclusion of version 3.0 of the .NET Framework, which consists of a class library and Common Language Runtime and OS/2 environment just like its NT predecessors. Version 3.0 includes four new major components:^[93]

These technologies are also available for Windows XP and Windows Server 2003 to facilitate their introduction to and usage by developers and end users.

There are also significant new development APIs in the core of the operating system, notably the completely re-designed audio, networking, print, and video interfaces, major changes to the security infrastructure, improvements to the deployment and installation of applications ("ClickOnce" and Windows Installer 4.0), new device driver development model ("Windows Driver Foundation"), Transactional NTFS, mobile computing API advancements (power management, Tablet PC Ink support, SideShow) and major updates to (or complete replacements of) many core subsystems such as Winlogon and CAPI.

There are some issues for software developers using some of the graphics APIs in Vista. Games or programs built solely on the Windows Vista-exclusive version of DirectX, version 10, cannot work on prior versions of Windows, as DirectX 10 is not available for previous Windows versions. Also, games that require the features of D3D9Ex, the updated implementation of DirectX 9 in Windows Vista are also incompatible with previous Windows versions.^[95] According to a Microsoft blog, there are three choices for OpenGL implementation on Vista. An application can use the default implementation, which translates OpenGL calls into the Direct3D API and is frozen at OpenGL version 1.4, or an application can use an Installable Client Driver (ICD), which comes in two flavors: legacy and Vista-compatible. A legacy ICD disables the Desktop Window Manager, a Vista-compatible ICD takes advantage of a new API, and is fully compatible with the Desktop Window Manager.^[96] At least two primary vendors, ATI and NVIDIA provided full Vista-compatible ICDs.^[97] However, hardware overlay is not supported, because it is considered as an obsolete feature in Vista. ATI and NVIDIA strongly recommend using compositing desktop/Framebuffer Objects for same functionality.^[98]

Installation[edit]

Windows Vista is the first Microsoft operating system:

Removed features[edit]

Some notable Windows XP features and components have been replaced or removed in Windows Vista, including several shell and Windows Explorer features, multimedia features, networking related functionality, Windows Messenger, NTBackup, the network Windows Messenger service, HyperTerminal, MSN Explorer, Active Desktop, and the replacement of NetMeeting with Windows Meeting Space. Windows Vista also does not include the Windows XP "Luna" visual theme, or most of the classic color schemes that have been part of Windows since the Windows 3.x era. The "Hardware profiles" startup feature has also been removed, along with support for older motherboard technologies like the EISA bus, APM and game port support (though on the 32-bit version game port support can be enabled by applying an older driver).^[102] IP over FireWire (TCP/IP over IEEE 1394) has been removed as well.^[103] The IPX/SPX protocol has also been removed, although it can be enabled by a third-party plug-in.^[104]

Editions[edit]

Windows Vista shipped in six different editions.^[105]