Back ويندوز 2000 Arabic Windows 2000 Azerbaijani Windows 2000 Byelorussian Windows 2000 Bulgarian উইন্ডোজ ২০০০ Bengali/Bangla Windows 2000 BS Windows 2000 Catalan Windows 2000 Czech Windows 2000 CV Microsoft Windows 2000 Danish

Windows 2000

Not to be confused with Windows Me.
"Windows NT 5.0" redirects here. For the code name of this operating system, see List of Microsoft codenames.

Windows 2000
Version of the Windows NT operating system
Screenshot of Windows 2000, showing the Start menu and the Getting Started with Windows window
DeveloperMicrosoft
OS familyMicrosoft Windows
Working stateNo longer supported
Source model
Released to
manufacturing		December 15, 1999 (1999-12-15)[2]
General
availability		February 17, 2000 (2000-02-17)[3]
Final releaseService Pack 4 with Update Rollup (5.0.2195) / September 13, 2005 (2005-09-13)[4]
Marketing targetBusiness and Server
Update method
PlatformsIA-32 (Alpha 64-bit in alpha, beta, and release candidate versions, preview release of IA-64)
Kernel typeHybrid (Windows NT kernel)
UserlandWindows API, NTVDM, OS/2 1.x, SFU
Default
user interface		Windows shell (Graphical)
LicenseProprietary commercial software
Preceded byWindows NT 4.0 (1996)
Succeeded byWindows XP Professional (client)
Windows Server 2003 (servers)
Official websiteWindows 2000 (archived at Wayback Machine)
Support status
Mainstream support ended on June 30, 2005
Extended support ended on July 13, 2010[5]

Windows 2000 is a major release of the Windows NT operating system developed by Microsoft, targeting the server and business markets. It is the direct successor to Windows NT 4.0, and was released to manufacturing on December 15, 1999,[2] and then to retail on February 17, 2000 for all versions, with Windows 2000 Datacenter Server being released to retail on September 26, 2000.

Windows 2000 introduces NTFS 3.0,[6] Encrypting File System,[7] and basic and dynamic disk storage.[8] Support for people with disabilities is improved over Windows NT 4.0 with a number of new assistive technologies,[9] and Microsoft increased support for different languages[10] and locale information.[11] The Windows 2000 Server family has additional features, most notably the introduction of Active Directory,[12] which in the years following became a widely used directory service in business environments. Although not present in the final release, support for Alpha 64-bit[13] was present in its alpha, beta, and release candidate versions. Its successor, Windows XP, only supports x86, x64 and Itanium processors. Windows 2000 was also the first NT release to drop the "NT" name from its product line.

Four editions of Windows 2000 have been released: Professional, Server, Advanced Server, and Datacenter Server;[14] the latter of which was launched months after the other editions.[15] While each edition of Windows 2000 is targeted at a different market, they share a core set of features, including many system utilities such as the Microsoft Management Console and standard system administration applications.

Microsoft marketed Windows 2000 as the most secure Windows version ever at the time;[16] however, it became the target of a number of high-profile virus attacks such as Code Red[17] and Nimda.[18] Windows 2000 was succeeded by Windows XP a little over a year and a half later in October 2001, while Windows 2000 Server was succeeded by Windows Server 2003 more than three years after its initial release on March 2003. For ten years after its release, it continued to receive patches for security vulnerabilities nearly every month until reaching the end of support on July 13, 2010, the same day that support ended for Windows XP SP2.[5] In 2008, Windows 2000 was still very common on older computers as well as on more modern ones, along with Windows XP, which was already the most prevalent in 2008.[19]

Both the original Xbox and the Xbox 360 use a modified version of the Windows 2000 kernel as their system software.[20][21] Its source code was leaked in 2020.[21]

  1. ^ "Microsoft Shared Source Initiative Overview". Microsoft. March 2003. Archived from the original on April 2, 2003. Retrieved February 17, 2017.
  2. ^ a b "Microsoft Releases Windows 2000 to Manufacturing". News Center. Microsoft. December 15, 1999. Archived from the original on June 4, 2019. Retrieved February 14, 2017.
  3. ^ "Gates Ushers in Next Generation of PC Computing With Launch of Windows 2000". News Center. Microsoft. February 17, 2000. Archived from the original on October 3, 2019. Retrieved February 17, 2018.
  4. ^ "Update Rollup 1 for Windows 2000 SP4 and known issues". Microsoft. Archived from the original on March 2, 2017. Retrieved February 17, 2017.
  5. ^ a b Cite error: The named reference Lifecycle was invoked but never defined (see the help page).
  6. ^ "New Capabilities and Features of the NTFS 3.0 File System". Microsoft Support. Microsoft. Archived from the original on October 24, 2007. Retrieved February 14, 2017.
  7. ^ "Implementing the Encrypting File System in Windows 2000". TechNet. Microsoft. March 24, 2009. Archived from the original on August 26, 2017. Retrieved February 14, 2017.
  8. ^ "Disk Management". TechNet. Microsoft. July 18, 2012. Archived from the original on December 22, 2016. Retrieved February 14, 2017.
  9. ^ "Windows 2000 Professional Accessibility Features". Microsoft. Archived from the original on December 17, 2003. Retrieved February 14, 2017.
  10. ^ "Frequently Asked Questions: Windows Server 2003, Windows XP, and Windows 2000 MUI". MSDN. Microsoft. Archived from the original on February 18, 2017. Retrieved February 17, 2017.
  11. ^ "Windows 2000 - List of Locale IDs and Language Groups". Global Development and Computing Portal. Microsoft. Archived from the original on February 3, 2003. Retrieved February 14, 2017.
  12. ^ "Windows 2000 Server Family". TechNet. Microsoft. July 18, 2012. Archived from the original on December 22, 2016. Retrieved February 17, 2017.
  13. ^ "Update: Microsoft cancels 64-bit Windows 2000 on Alpha". ITPro Today: IT News, How-Tos, Trends, Case Studies, Career Tips, More. August 26, 1999. Archived from the original on December 12, 2023. Retrieved December 12, 2023.
  14. ^ "Microsoft Renames Windows NT 5.0 Product Line to Windows 2000; Signals Evolution of Windows NT Technology Into Mainstream". News Center. Microsoft. October 27, 1998. Archived from the original on January 12, 2009. Retrieved February 14, 2017.
  15. ^ "Microsoft Announces Final Packaging for Windows 2000". News Center. Microsoft. August 17, 1999. Archived from the original on May 8, 2014. Retrieved February 14, 2017.
  16. ^ "Microsoft and CyberSafe Extend Windows 2000 Security Across the Enterprise". News Center. Microsoft. January 17, 2000. Archived from the original on February 18, 2017. Retrieved February 17, 2017.
  17. ^ "'Code Red' Worm Exploiting Buffer Overflow in IIS Indexing Service DLL". CERT Coordination Center. Software Engineering Institute. July 19, 2001. Archived from the original on August 17, 2016. Retrieved May 17, 2019.
  18. ^ Swartz, Jon (September 25, 2001). "Nimba called most serious Net attack on business". USA Today. Gannett Company. Archived from the original on February 17, 2017. Retrieved February 17, 2017.
  19. ^ "Para fãs, Windows 2000 é o melhor dos sistemas já criados pela MS - 27/06/2008 - UOL Tecnologia". tecnologia.uol.com.br. Retrieved June 18, 2025.
  20. ^ Trinder, Garry (February 17, 2006). "The Xbox Operating System". Xbox Engineering. MSDN. Archived from the original on November 2, 2018. Retrieved October 31, 2018.
  21. ^ a b Warren, Tom (May 21, 2020). "Xbox and Windows NT 3.5 source code leaks online".

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