Personal computer operating system by Microsoft released in
|A version of the Windows NT operating system|
|Released to |
|August24, ; 19years ago()|
|October25, ; 18years ago()|
|Final release||Service Pack 3 () / April21, ; 12years ago()|
|Platforms||IA, x, and Itanium|
|Kernel type||Hybrid (NT)|
|Preceded by||Windows () |
Windows Me ()
|Succeeded by||Windows Vista ()|
Windows XP is an operating system produced by Microsoft as part of the Windows NT family of operating systems. It was the successor to both Windows for professional users and Windows Me for home users. It was released to manufacturing on August 24, , and broadly released for retail sale on October 25,
Development of Windows XP began in the late s as "Neptune", an operating system (OS) built on the Windows NT kernel which was intended specifically for mainstream consumer use. An updated version of Windows was also originally planned for the business market; however, in January , both projects were scrapped in favor of a single OS codenamed "Whistler", which would serve as a single OS platform for both consumer and business markets. As such, Windows XP was the first consumer edition of Windows not to be based on MS-DOS.
Upon its release, Windows XP received critical acclaim, with critics noting increased performance and stability (especially in comparison to Windows Me), a more intuitive user interface, improved hardware support, and expanded multimedia capabilities. However, some industry reviewers were concerned by the new licensing model and product activation system.
Extended support for Windows XP ended on April 8, , after which the operating system ceased receiving further support or security updates (with exceptional security updates being made e.g. in , to address potential ransomware threats, like BlueKeep) to most users. By August , Microsoft (and others) had ended support for games on Windows XP. As of August[update], % of Windows PCs run Windows XP, and % of all devices across all platforms run Windows XP. At least a few countries have double-digit use, e.g. Armenia, where it's being replaced by Windows 10, with both operating systems having over 40% use.
In the late s, initial development of what would become Windows XP was focused on two individual products: "Odyssey", which was reportedly intended to succeed the future Windows ; and "Neptune", which was reportedly a consumer-oriented operating system using the Windows NT architecture, succeeding the MS-DOS-based Windows 
However, the projects proved to be too ambitious. In January , shortly prior to the official release of Windows , technology writer Paul Thurrott reported that Microsoft had shelved both Neptune and Odyssey in favor of a new product codenamed "Whistler", after Whistler, British Columbia, as many Microsoft employees skied at the Whistler-Blackcomb ski resort. The goal of Whistler was to unify both the consumer and business-oriented Windows lines under a single, Windows NT platform: Thurrott stated that Neptune had become "a black hole when all the features that were cut from Windows Me were simply re-tagged as Neptune features. And since Neptune and Odyssey would be based on the same code-base anyway, it made sense to combine them into a single project".
At PDC on July 13, , Microsoft announced that Whistler would be released during the second half of , and also unveiled the first preview build, The build notably introduced an early version of Windows XP's visual styles system.
Microsoft released the first beta build of Whistler, build , on October 31, Subsequent builds gradually introduced features that users of the release version of Windows XP would recognize, such as Internet Explorer , the Microsoft Product Activation system and the Bliss desktop background.
Whistler was officially unveiled during a media event on February 5, , under the name Windows XP, where XP stands for "eXPerience".
In June , Microsoft indicated that it was planning to, in conjunction with Intel and other PC makers, spend at least 1 billion US dollars on marketing and promoting Windows XP. The theme of the campaign, "Yes You Can", was designed to emphasize the platform's overall capabilities. Microsoft had originally planned to use the slogan "Prepare to Fly", but it was replaced because of sensitivity issues in the wake of the September 11 attacks.
On August 24, , Windows XP build was released to manufacturing (RTM). During a ceremonial media event at Microsoft Redmond Campus, copies of the RTM build were given to representatives of several major PC manufacturers in briefcases, who then flew off on decorated helicopters. While PC manufacturers would be able to release devices running XP beginning on September 24, , XP was expected to reach general, retail availability on October 25, On the same day, Microsoft also announced the final retail pricing of XP's two main editions, "Home" and "Professional".
New and updated features
Updated start menu in the Royale theme, now featuring two columns
While retaining some similarities to previous versions, Windows XP's interface was overhauled with a new visual appearance, with an increased use of alpha compositing effects, drop shadows, and "visual styles", which completely changed the appearance of the operating system. The number of effects enabled are determined by the operating system based on the computer's processing power, and can be enabled or disabled on a case-by-case basis. XP also added ClearType, a new subpixel rendering system designed to improve the appearance of fonts on liquid-crystal displays. A new set of system icons was also introduced. The default wallpaper, Bliss, is a photo of a landscape in the Napa Valley outside Napa, California, with rolling green hills and a blue sky with stratocumulus and cirrus clouds.
The Start menu received its first major overhaul in XP, switching to a two-column layout with the ability to list, pin, and display frequently used applications, recently opened documents, and the traditional cascading "All Programs" menu. The taskbar can now group windows opened by a single application into one taskbar button, with a popup menu listing the individual windows. The notification area also hides "inactive" icons by default. A "common tasks" list was added, and Windows Explorer's sidebar was updated to use a new task-based design with lists of common actions; the tasks displayed are contextually relevant to the type of content in a folder (e.g. a folder with music displays offers to play all the files in the folder, or burn them to a CD).
The "task grouping" feature introduced in Windows XP showing both grouped and individual items
Fast user switching allows additional users to log into a Windows XP machine without existing users having to close their programs and logging out. Although only one user at the time can use the console (i.e. monitor, keyboard and mouse), previous users can resume their session once they regain control of the console.
Windows XP uses prefetching to improve startup and application launch times. It also became possible to revert the installation of an updated device driver, should the updated driver produce undesirable results.
A copy protection system known as Windows Product Activation was introduced with Windows XP and its server counterpart, Windows Server All Windows licenses must be tied to a unique ID generated using information from the computer hardware, transmitted either via the internet or a telephone hotline. If Windows is not activated within 30 days of installation, the OS will cease to function until it is activated. Windows also periodically verifies the hardware to check for changes. If significant hardware changes are detected, the activation is voided, and Windows must be re-activated.
Networking and internet functionality
Windows XP was originally bundled with Internet Explorer 6, Outlook Express 6, Windows Messenger, and MSN Explorer. New networking features were also added, including Internet Connection Firewall, Internet Connection Sharing integration with UPnP, NAT traversal APIs, Quality of Service features, IPv6 and Teredo tunneling, Background Intelligent Transfer Service, extended fax features, network bridging, peer to peer networking, support for most DSL modems, IEEE (Wi-Fi) connections with auto configuration and roaming, TAPI , and networking over FireWire.Remote Assistance and Remote Desktop were also added, which allow users to connect to a computer running Windows XP from across a network or the Internet and access their applications, files, printers, and devices or request help. Improvements were also made to IntelliMirror features such as Offline Files, Roaming user profiles and Folder redirection.
- Improved application compatibility and shims compared to Windows 
- DirectX , upgradeable to DirectX c.
- A number of new features in Windows Explorer including task panes, thumbnails, and the option to view photos as a slideshow.
- Improved imaging features such as Windows Picture and Fax Viewer.
- Faster start-up, (because of improved Prefetch functions) logon, logoff, hibernation, and application launch sequences.
- Numerous improvements to increase the system reliability such as improved System Restore,Automated System Recovery, and driver reliability improvements through Device Driver Rollback.
- Hardware support improvements such as FireWire , and improvements to multi-monitor support under the name "DualView".
- Fast user switching.
- The ClearType font rendering mechanism, which is designed to improve text readability on liquid-crystal display (LCD) and similar monitors, especially laptops.
- Side-by-side assemblies and registration-free COM.
- General improvements to international support such as more locales, languages and scripts, MUI support in Terminal Services, improved Input Method Editors, and National Language Support.
Some of the programs and features that were part of the previous versions of Windows did not make it to Windows XP. Various MS-DOS commands available in its Windows 9x predecessor were removed, as were the POSIX & OS/2 subsystems.
In networking, NetBEUI, NWLink and NetDDE were deprecated and not installed by default.Plug-and-play–incompatible communication devices (like modems and network interface cards) were no longer supported.
Service Pack 2 and Service Pack 3 also removed features from Windows XP, but to a less noticeable extent. For instance, support for TCP half-open connections was removed in Service Pack 2, and the address bar on the taskbar was removed in Service Pack 3.
Diagram representing the main editions of Windows XP. It is based on the category of the edition (grey) and codebase (black arrow).
Windows XP was released in two major editions on launch: Home Edition and Professional Edition. Both editions were made available at retail as pre-loaded software on new computers and as boxed copies. Boxed copies were sold as "Upgrade" or "Full" licenses; the "Upgrade" versions were slightly cheaper, but require an existing version of Windows to install. The "Full" version can be installed on systems without an operating system or existing version of Windows. The two editions of XP were aimed at different markets: Home Edition is explicitly intended for consumer use and disables or removes certain advanced and enterprise-oriented features present on Professional, such as the ability to join a Windows domain, Internet Information Services, and Multilingual User Interface. Windows 98 or Me can be upgraded to either edition, but Windows NT and Windows can only be upgraded to Professional. Windows' software license agreement for pre-loaded licenses allows the software to be "returned" to the OEM for a refund if the user does not wish to use it. Despite the refusal of some manufacturers to honor the entitlement, it has been enforced by courts in some countries.
Two specialized variants of XP were introduced in for certain types of hardware, exclusively through OEM channels as pre-loaded software. Windows XP Media Center Edition was initially designed for high-end home theater PCs with TV tuners (marketed under the term "Media Center PC"), offering expanded multimedia functionality, an electronic program guide, and digital video recorder (DVR) support through the Windows Media Center application. Microsoft also unveiled Windows XP Tablet PC Edition, which contains additional pen input features, and is optimized for mobile devices meeting its Tablet PC specifications. Two different bit editions of XP were made available; the first, Windows XP Bit Edition, was intended for IA (Itanium) systems; as IA usage declined on workstations in favor of AMD's x architecture (which was supported by the later Windows XP Professional x64 Edition), the Itanium edition was discontinued in 
Microsoft also targeted emerging markets with the introduction of Windows XP Starter Edition, a special variant of Home Edition intended for low-cost PCs. The OS is primarily aimed at first-time computer owners, containing heavy localization (including wallpapers and screen savers incorporating images of local landmarks), and a "My Support" area which contains video tutorials on basic computing tasks. It also removes certain "complex" features, and does not allow users to run more than three applications at a time. After a pilot program in India and Thailand, Starter was released in other emerging markets throughout  In , Microsoft also unveiled the FlexGo initiative, which would also target emerging markets with subsidized PCs on a pre-paid, subscription basis.
As the result of unfair competition lawsuits in Europe and South Korea, which both alleged that Microsoft had improperly leveraged its status in the PC market to favor its own bundled software, Microsoft was ordered to release special editions of XP in these markets that excluded certain applications. In March , after the European Commissionfined Microsoft € million (US$ million), Microsoft was ordered to release "N" editions of XP that excluded Windows Media Player, encouraging users to pick and download their own media player software. As it was sold at the same price as the edition with Windows Media Player included, certain OEMs (such as Dell, who offered it for a short period, along with Hewlett-Packard, Lenovo and Fujitsu Siemens) chose not to offer it. Consumer interest was minuscule, with roughly 1, units shipped to OEMs, and no reported sales to consumers. In December , the Korean Fair Trade Commission ordered Microsoft to make available editions of Windows XP and Windows Server that do not contain Windows Media Player or Windows Messenger. The "K" and "KN" editions of Windows XP were released in August , and are only available in English and Korean, and also contain links to third-party instant messenger and media player software.
A service pack is a cumulative update package that is a superset of all updates, and even service packs, that have been released before it. Three service packs have been released for Windows XP. Service Pack 3 is slightly different, in that it needs at least Service Pack 1 to have been installed, in order to update a live OS. However, Service Pack 3 can still be embedded into a Windows installation disc; SP1 is not reported as a prerequisite for doing so.
Service Pack 1
Service Pack 1 (SP1) for Windows XP was released on September 9, It contained over minor, post-RTM bug fixes, along with all security patches released since the original release of XP. SP1 also added USB support, the Microsoft Java Virtual Machine, .NET Framework support, and support for technologies used by the then-upcoming Media Center and Tablet PC editions of XP. The most significant change on SP1 was the addition of Set Program Access and Defaults, a settings page which allows programs to be set as default for certain types of activities (such as media players or web browsers) and for access to bundled, Microsoft programs (such as Internet Explorer or Windows Media Player) to be disabled. This feature was added to comply with the settlement of United States v. Microsoft Corp., which required Microsoft to offer the ability for OEMs to bundle third-party competitors to software it bundles with Windows (such as Internet Explorer and Windows Media Player), and give them the same level of prominence as those normally bundled with the OS.
On February 3, , Microsoft released Service Pack 1a (SP1a). It was the same as SP1, except, the Microsoft Java Virtual Machine was excluded.
Service Pack 2
Service Pack 2 (SP2) was released on August 25,  Headline features included WPA encryption compatibility for Wi-Fi & usability improvements to the Wi-Fi networking user interface, partial Bluetooth support, and various improvements to security systems.
The security improvements (codenamed "Springboard", as these features were intended to underpin additional changes in Longhorn), included a major revision to the included firewall (renamed Windows Firewall, and now enabled by default), and an update to Data Execution Prevention, which gained hardware support in the NX bit that can stop some forms of buffer overflow attacks. Raw socket support is removed (which supposedly limits the damage done by zombie machines) and the Windows Messenger service (which had been abused to cause pop-up advertisements to be displayed as system messages without a web browser or any additional software) became disabled by default. Additionally, security-related improvements were made to e-mail and web browsing. Service Pack 2 also added Security Center, an interface which provides a general overview of the system's security status, including the state of the firewall and automatic updates. Third-party firewall and antivirus software can also be monitored from Security Center.
The unique boot screens that identified the edition of Windows XP currently running, including a green progress bar for Home Edition and a blue progress bar for other editions, were removed and replaced with a generic "Windows XP" boot screen with a blue progress bar with this service pack.
In August , Microsoft released updated installation media for Windows XP and Windows Server SP2 (SP2b), in order to incorporate a patch requiring ActiveX controls in Internet Explorer to be manually activated before a user may interact with them. This was done so that the browser would not violate a patent owned by Eolas. Microsoft has since licensed the patent, and released a patch reverting the change in April  In September , another minor revision known as SP2c was released for XP Professional, extending the number of available product keys for the operating system to "support the continued availability of Windows XP Professional through the scheduled system builder channel end-of-life (EOL) date of January 31, "
Service Pack 3
The third and final Service Pack, SP3, was released to manufacturing on April 21, , and to the public via both the Microsoft Download Center and Windows Update on May 6,  Service Pack 3 is not available for Windows XP x64 Edition, which is based on the Windows Server kernel and, as a result, uses its service packs rather than the ones for the other editions.
It began being automatically pushed out to Automatic Updates users on July 10,  A feature set overview which details new features available separately as stand-alone updates to Windows XP, as well as backported features from Windows Vista, has been posted by Microsoft. A total of 1, fixes are included in SP3. Service Pack 3 can be installed on systems with Internet Explorer versions 6, 7, or 8; Internet Explorer 7 is not included as part of SP3.
Service Pack 3 included security enhancements over and above those of SP2, including APIs allowing developers to enable Data Execution Prevention for their code, independent of system-wide compatibility enforcement settings, the Security Support Provider Interface, improvements to WPA2 security, and an updated version of the Microsoft Enhanced Cryptographic Provider Module that is FIPS certified.
In incorporating all previously released updates not included in SP2, Service Pack 3 included many other key features. Windows Imaging Component allowed camera vendors to integrate their own proprietary image codecs with the operating system's features, such as thumbnails and slideshows. In enterprise features, Remote Desktop Protocol included support for ClearType and bit color depth over RDP, while improvements made to Windows Management Instrumentation in Windows Vista to reduce the possibility of corruption of the WMI repository were backported to XP SP3.
In addition, SP3 contains updates to the operating system components of Windows XP Media Center Edition (MCE) and Windows XP Tablet PC Edition, and security updates for .NET Framework version , which is included in these editions. However, it does not include update rollups for the Windows Media Center application in Windows XP MCE  SP3 also omits security updates for Windows Media Player 10, although the player is included in Windows XP MCE  The Address Bar DeskBand on the Taskbar is no longer included because of antitrust violation concerns.
System requirements for Windows XP are as follows:
- ^"System requirements for Windows XP operating systems". April 28, Archived from the original on August 6, Retrieved March 12,
- ^Even though this is Microsoft's stated minimum processor speed for Windows XP, it is possible to install and run the operating system on early IA processors such as a P5Pentium without MMX instructions. Windows XP is not compatible with processors older than Pentium (such as ) or the Cyrix 6x86 because it requires instructions.
- ^"Windows XP Minimal Requirement Test". cipsas.com September 9, Archived from the original on December 21, Retrieved January 1,
- ^ abcde"Windows XP: Required firmware and partition mapping scheme of hard disk drive". cipsas.com June 26, Archived from the original on April 27, Retrieved June 16,
- ^A Microsoft TechNet paper from Summer (before Windows XP's actual release), states that: "A computer with 64 MB of RAM will have sufficient resources to run Windows XP and a few applications with moderate memory requirements." (Emphasis added.) These were said to be office productivity applications, e-mail programs, and web browsers (of the time). With such a configuration, user interface enhancements and fast user switching are turned off by default. For comparable workloads, 64 MB of RAM was then regarded as providing an equal or better user experience on Windows XP with similar settings than it would with Windows Me on the same hardware. In a later section of the paper, superior performance over Windows Me was noted with MB of RAM or more, and with computers that exceed the minimum hardware requirements.
- ^Sechrest, Stuart; Fortin, Michael (June 1, ). "Windows XP Performance". Microsoft TechNet. Archived from the original on July 27, Retrieved April 8,
- ^"Hard disk space requirements for Windows XP Service Pack 1". Microsoft. October 29, Archived from the original on April 21, Retrieved April 6,
- ^"The hard disk space requirements for Windows XP Service Pack 2". Microsoft. April 18, Archived from the original on November 24, Retrieved December 1,
- ^"Windows XP – End of Support, Migration Guide, Download – TechNet". cipsas.com. Archived from the original on May 13,
- ^"Windows XP Professional x64 Edition SP2 VL EN (MSDN-TechNet)". Programmer Stuffs. March 23, Archived from the original on July 14, Retrieved May 2,
- ^"Microsoft Windows XP Bit Edition". Microsoft TechNet. Microsoft. August 15, Archived from the original on April 19, Retrieved May 2,
Physical memory limits
The maximum amount of RAM that Windows XP can support varies depending on the product edition and the processor architecture, as shown in the following table.
Windows XP Professional supports up to two physical processors; Windows XP Home Edition is limited to one.
However, XP supports a greater number of logical processors: bit editions support up to 32 logical processors, whereas bit editions support up to 64 logical processors.
The official exceptions below no longer apply, as to April , at the most.
|Applicable XP editions:|
|Home Edition, Professional Edition, Professional x64 Edition, Professional for Embedded Systems, Media Center Editions (all), Starter Edition, Tablet PC Edition and Tablet PC Edition , as well as Windows Fundamentals for Legacy PCs.|
|Windows XP Bit Edition (Itanium edition, including Version )||Mainstream support ended on June 30, |
|Windows XP Embedded||Mainstream support ended on January 11, |
Extended support ended on January 12, 
|Windows Embedded for Point of Service||Mainstream support ended on April 12, |
Extended support ended on April 12, 
|Windows Embedded Standard ||Mainstream support ended on January 14, |
Extended support ended on January 8, 
|Windows Embedded POSReady ||Mainstream support ended on April 8, |
Extended support ended on April 9, 
Support for Windows XP without a service pack ended on September 30,  Windows XP Service Packs 1 and 1a were retired on October 10, , and Service Pack 2 reached end of support on July 13, , almost six years after its general availability. The company stopped general licensing of Windows XP to OEMs and terminated retail sales of the operating system on June 30, , 17 months after the release of Windows Vista. However, an exception was announced on April 3, , for OEMs producing what it defined as "ultra low-cost personal computers", particularly netbooks, until one year after the availability of Windows 7 on October 22, Analysts felt that the move was primarily intended to compete against Linux-based netbooks, although Microsoft's Kevin Hutz stated that the decision was due to apparent market demand for low-end computers with Windows.
Variants of Windows XP for embedded systems have different support policies: Windows XP Embedded SP3 and Windows Embedded for Point of Service SP3 were supported until January and April , respectively. Windows Embedded Standard and Windows Embedded POSReady were supported until January and April , respectively. These updates, while intended for the embedded editions, could also be downloaded on standard Windows XP with a registry hack, which enabled unofficial patches until April However, Microsoft advised against Windows XP users installing these fixes.
End of support
On April 14, , Windows XP exited mainstream support and entered the extended support phase; Microsoft continued to provide security updates every month for Windows XP, however, free technical support, warranty claims, and design changes were no longer being offered. Extended support ended on April 8, , over 12 years since the release of XP; normally Microsoft products have a support life cycle of only 10 years. Beyond the final security updates released on April 8, no more security patches or support information are provided for XP free-of-charge; "critical patches" will still be created, and made available only to customers subscribing to a paid "Custom Support" plan. As it is a Windows component, all versions of Internet Explorer for Windows XP also became unsupported.
In January , it was estimated that more than 95% of the 3 million automated teller machines in the world were still running Windows XP (which largely replaced IBM's OS/2 as the predominant operating system on ATMs); ATMs have an average lifecycle of between seven and ten years, but some have had lifecycles as long as Plans were being made by several ATM vendors and their customers to migrate to Windows 7-based systems over the course of , while vendors have also considered the possibility of using Linux-based platforms in the future to give them more flexibility for support lifecycles, and the ATM Industry Association (ATMIA) has since endorsed Windows 10 as a further replacement. However, ATMs typically run the embedded variant of Windows XP, which was supported through January  As of May , around 60% of the , ATMs in India still run Windows XP.
Furthermore, at least 49% of all computers in China still ran XP at the beginning of These holdouts were influenced by several factors; prices of genuine copies of Windows in the country are high, while Ni Guangnan of the Chinese Academy of Sciences warned that Windows 8 could allegedly expose users to surveillance by the United States government, and the Chinese government would ban the purchase of Windows 8 products for government use in May in protest of Microsoft's inability to provide "guaranteed" support. The government also had concerns that the impending end of support could affect their anti-piracy initiatives with Microsoft, as users would simply pirate newer versions rather than purchasing them legally. As such, government officials formally requested that Microsoft extend the support period for XP for these reasons. While Microsoft did not comply with their requests, a number of major Chinese software developers, such as Lenovo, Kingsoft and Tencent, will provide free support and resources for Chinese users migrating from XP. Several governments, in particular those of the Netherlands and the United Kingdom, elected to negotiate "Custom Support" plans with Microsoft for their continued, internal use of Windows XP; the British government's deal lasted for a year, and also covered support for Office (which reached end-of-life the same day) and cost £ million.
On March 8, , Microsoft deployed an update for XP that, on the 8th of each month, displays a pop-up notification to remind users about the end of support; however, these notifications may be disabled by the user. Microsoft also partnered with Laplink to provide a special "express" version of its PCmover software to help users migrate files and settings from XP to a computer with a newer version of Windows.