Windows Server (formerly Windows NT Server) is a brand name for

server Server may refer to: Computing *Server (computing), a computer program or a device that provides requested information for other programs or devices, called clients. Role * Waiting staff, those who work at a restaurant or a bar attending custome ...

-oriented releases of the

Windows NT Windows NT is a Proprietary software, proprietary Graphical user interface, graphical operating system produced by Microsoft as part of its Windows product line, the first version of which, Windows NT 3.1, was released on July 27, 1993. Original ...

operating system (OS) that have been developed by

Microsoft Microsoft Corporation is an American multinational corporation and technology company, technology conglomerate headquartered in Redmond, Washington. Founded in 1975, the company became influential in the History of personal computers#The ear ...

since 1993. The first release under this brand name is Windows NT 3.1 Advanced Server, an edition of

Windows NT 3.1 Windows NT 3.1 is the first major release of the Windows NT operating system developed by Microsoft, released on July 27, 1993. It marked the company's entry into the corporate computing environment, designed to support large networks and to be ...

. With the release of

Windows Server 2003 Windows Server 2003, codenamed "Whistler Server", is the sixth major version of the Windows NT operating system produced by Microsoft and the first server version to be released under the Windows Server brand name. It is part of the Windows NT ...

, Microsoft started releasing new versions under the name Windows Server. The latest release of Windows NT under the Windows Server brand is Windows Server 2025. Microsoft's history of developing operating systems for servers goes back to Windows NT 3.1 Advanced Server.

Windows 2000 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 Software release life cycle#Release to manufacturing (RT ...

Server is the first release to include

Active Directory Active Directory (AD) is a directory service developed by Microsoft for Windows domain networks. Windows Server operating systems include it as a set of processes and services. Originally, only centralized domain management used Active Direct ...

DNS The Domain Name System (DNS) is a hierarchical and distributed name service that provides a naming system for computers, services, and other resources on the Internet or other Internet Protocol (IP) networks. It associates various informatio ...

Server,

DHCP The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on Internet Protocol (IP) networks for automatically assigning IP addresses and other communication parameters to devices connected to the network using a clie ...

Server, and

Group Policy Group Policy is a feature of the Microsoft Windows NT family of operating systems (including Windows 8.1, Windows 10, Windows 11) that controls the working environment of user accounts and computer accounts. Group Policy provides centralized mana ...

History

Windows NT Server 3.x

Windows NT 3.1 Advanced Server was released on July 27, 1993 as an edition of Windows NT 3.1, an operating system aimed towards business and server use. As with its Workstation counterpart, Windows NT 3.1 Advanced Server was a 32 bit rewrite of the Windows kernel that retained a similar use interface to Windows 3.1. Unlike the latter, however, Windows NT 3.1 Advanced Server was a complete operating system that did not need to be run from

DOS DOS (, ) is a family of disk-based operating systems for IBM PC compatible computers. The DOS family primarily consists of IBM PC DOS and a rebranded version, Microsoft's MS-DOS, both of which were introduced in 1981. Later compatible syste ...

. Windows NT 3.1 Advanced Server, like its Workstation counterpart, featured new features such as

multiuser Multi-user software is computer software that allows access by multiple users of a computer. Time-sharing systems are multi-user systems. Most batch processing systems for mainframe computers may also be considered "multi-user", to avoid leavin ...

support and

preemptive multitasking In computing, preemption is the act performed by an external scheduler — without assistance or cooperation from the task — of temporarily interrupting an executing task, with the intention of resuming it at a later time. This preemptive sc ...

. In 1994, Microsoft released Windows NT Server 3.5. It introduced

TCP/IP The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suite are ...

and

Winsock In computing, the Windows Sockets API (WSA), later shortened to Winsock, is an application programming interface (API) that defines how Windows network application software should access network services, especially TCP/IP. It defines a standar ...

support integrated into the operating system, alongside the ability to use

FTP The File Transfer Protocol (FTP) is a standard communication protocol used for the transfer of computer files from a server to a client on a computer network. FTP is built on a client–server model architecture using separate control and dat ...

. It also supported VFAT. In 1995, Microsoft released Windows NT Server 3.51, an update to Windows NT Server 3.5, which added NTFS compression and support for the

PowerPC PowerPC (with the backronym Performance Optimization With Enhanced RISC – Performance Computing, sometimes abbreviated as PPC) is a reduced instruction set computer (RISC) instruction set architecture (ISA) created by the 1991 Apple Inc., App ...

architecture.

Windows NT Server 4.0

In 1996, Microsoft released Windows NT Server 4.0. It added the new user interface introduced in

Windows 95 Windows 95 is a consumer-oriented operating system developed by Microsoft and the first of its Windows 9x family of operating systems, released to manufacturing on July 14, 1995, and generally to retail on August 24, 1995. Windows 95 merged ...

the previous year. In addition, it dropped support for the PowerPC, Alpha, and MIPS architectures. Microsoft updated Winsock to version 2 and IIS 2.0 and FrontPage are included.

Windows 2000 Server

Windows Server 2003

Windows Server 2003 is based on a modified version of

Windows XP Windows XP is a major release of Microsoft's Windows NT operating system. It was released to manufacturing on August 24, 2001, and later to retail on October 25, 2001. It is a direct successor to Windows 2000 for high-end and business users a ...

Windows Server 2008 and 2008 R2

Windows Server 2008 is based on

Windows Vista SP1 Windows Vista is a major release of the Windows NT operating system developed by Microsoft. It was the direct successor to Windows XP, released five years earlier, which was then the longest time span between successive releases of Microsoft W ...

, while Windows Server 2008 R2 is based on

Windows 7 Windows 7 is a major release of the Windows NT operating system developed by Microsoft. It was Software release life cycle#Release to manufacturing (RTM), released to manufacturing on July 22, 2009, and became generally available on October 22, ...

Windows Server 2012 and 2012 R2

Windows Server 2012 is based on

Windows 8 Windows 8 is a major release of the Windows NT operating system developed by Microsoft. It was Software release life cycle#Release to manufacturing (RTM), released to manufacturing on August 1, 2012, made available for download via Microsoft ...

, while Windows Server 2012 R2 is based on

Windows 8.1 Windows 8.1 is a release of the Windows NT operating system developed by Microsoft. It was released to manufacturing on August 27, 2013, and broadly released for retail sale on October 17, 2013, about a year after the retail release of its pr ...

Windows Server 2016, 2019 and 2022

These versions of Windows Server are all based on

Windows 10 Windows 10 is a major release of Microsoft's Windows NT operating system. The successor to Windows 8.1, it was Software release cycle#Release to manufacturing (RTM), released to manufacturing on July 15, 2015, and later to retail on July 2 ...

. Windows Server 2016 is based on

Windows 10, version 1607 Windows 10 Anniversary Update (also known as version 1607 and codenamed "Redstone 1") is the second major update to Windows 10 and the first in a series of updates under the Redstone codenames. It carries the build number 10.0.14393. This update, ...

, Windows Server 2019 is based on

Windows 10, version 1809 Windows 10 October 2018 Update (also known as version 1809 and codenamed "Redstone 5") is the sixth major update to Windows 10 and the fifth in a series of updates under the Redstone codenames. It carries the build number 10.0.17763. Version his ...

and Windows Server 2022 is based on a modified version of

Windows 10, version 21H2 The Windows 10 November 2021 Update (codenamed "21H2") is the twelfth major update to Windows 10 as the cumulative update to the May 2021 Update. It carries the build number 10.0.19044. Version history The first preview was released on July 15, ...

Windows Server 2025

This version of Windows Server is based on

Windows 11 Windows 11 is a version of Microsoft's Windows NT operating system, released on October 5, 2021, as the successor to Windows 10 (2015). It is available as a free upgrade for devices running Windows 10 that meet the #System requirements, Windo ...

. Windows Server 2025 is based on

Windows 11, version 24H2 The Windows 11 2024 Update (also known as version 24H2, codenamed Hudson Valley) is the third and latest major update to Windows 11. It carries the build number 10.0.26100. Overview The first preview was released to Insiders who opted in to ...

Members

Main releases

Main releases include: * Windows NT 3.1 Advanced Server (July 27, 1993) * Windows NT Server 3.5 (September 21, 1994) * Windows NT Server 3.51 (May 30, 1995) * Windows NT 4.0 Server (August 24, 1996) *

Windows 2000 Server 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 Software release life cycle#Release to manufacturing (RT ...

(December 15, 1999) *

(April 24, 2003) *

Windows Server 2003 R2 Windows Server 2003, codenamed "Whistler Server", is the sixth major version of the Windows NT operating system produced by Microsoft and the first server version to be released under the Windows Server brand name. It is part of the Windows NT ...

(December 6, 2005) *

Windows Server 2008 Windows Server 2008, codenamed "Longhorn Server" (alternatives: "Windows Vista Server" or "Windows Server Vista"), is the seventh major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server b ...

(February 27, 2008) *

Windows Server 2008 R2 Windows Server 2008 R2, codenamed "Windows Server 7" or "Windows Server 2008 Release 2", is the eighth major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server brand name. It was release ...

(October 22, 2009) *

Windows Server 2012 Windows Server 2012, codenamed "Windows Server 8", is the ninth major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server brand name. It is the server version of Windows based on Windows ...

(September 4, 2012) *

Windows Server 2012 R2 Windows Server 2012 R2, codenamed "Windows Server Blue", is the tenth major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server brand name. It was unveiled on June 3, 2013, at TechEd Nort ...

(October 17, 2013) *

Windows Server 2016 Windows Server 2016 is the eleventh major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server brand name. It was developed alongside Windows 10 and is the successor to the Windows 8.1-based ...

(October 12, 2016) *

Windows Server 2019 Windows Server 2019 is the twelfth major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server brand name. It is the second version of the server operating system based on the Windows 10 plat ...

(October 2, 2018) *

Windows Server 2022 Windows Server 2022 is the thirteenth major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server brand name. It was announced at Microsoft's Ignite event from March 2–4, 2021. It was rele ...

(August 18, 2021) *

Windows Server 2025 Windows Server 2025 is the fourteenth and current major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server brand name. It was released on November 1, 2024. Microsoft announced that the su ...

(November 1, 2024) Traditionally, Microsoft supports Windows Server for 10 years, with five years of mainstream support and an additional five years of extended support. These releases also offer a complete desktop experience. Starting with Windows Server 2008, Server Core and Nano Server configurations were made available to reduce the OS footprint. Between 2015 and 2021, Microsoft referred to these releases as "

long-term support Long-term support (LTS) is a product lifecycle management policy in which a stable release of computer software is maintained for a longer period of time than the standard edition. The term is typically reserved for open-source software, where it ...

" releases to set them apart from semi-annual releases (see below.) For sixteen years, Microsoft released a major version of Windows Server every four years, with one minor version released two years after a major release. The minor versions had an "R2" suffix in their names. In October 2018, Microsoft broke this tradition with the release of Windows Server 2019, which would have been "Windows Server 2016 R2". Windows Server 2022 is also a minor upgrade over its predecessor.

Branded releases

Certain editions of Windows Server have a customized name: *Windows Storage Server (editions of Windows Server 2003 through 2016; editions of Windows Server IoT 2019 and its successors) *

Windows HPC Server 2008 Windows HPC Server 2008, released by Microsoft on 22 September 2008, is the successor product to Windows Compute Cluster Server 2003. Like WCCS, Windows HPC Server 2008 is designed for high-end applications that require high performance computing ...

* Windows HPC Server 2008 R2 *

Windows Home Server Windows Home Server (code-named Quattro) is a home server operating system from Microsoft. It was announced on 7 January 2007 at the Consumer Electronics Show by Bill Gates, released to manufacturing on 16 July 2007 and officially released o ...

(an edition of Windows Server 2003) *

Windows Home Server 2011 Windows Home Server 2011, code named Vail, is a home server operating system by Microsoft designed for small office/home offices and homes with multiple connected PCs to offer protected file storage, file sharing, automated PC backup, remote a ...

(an edition of Windows Server 2008 R2) *

Hyper-V Hyper-V is a native hypervisor developed by Microsoft; it can create virtual machines on x86-64 systems running Windows. It is included in Pro and Enterprise editions of Windows (since Windows 8) as an optional feature to be manually enabled. A ...

Server (a discontinued,

freeware Freeware is software, often proprietary, that is distributed at no monetary cost to the end user. There is no agreed-upon set of rights, license, or EULA that defines ''freeware'' unambiguously; every publisher defines its own rules for the free ...

edition of Windows Server 2008 through 2019) *

Windows MultiPoint Server Windows MultiPoint Server is an operating system based on Microsoft Windows Server using Remote Desktop Services technology to host multiple simultaneous independent computing stations or terminals connected to a single computer ( multiseat compu ...

Windows Server Essentials Windows Server Essentials (formerly Small Business Server or SBS) is an integrated server suite from Microsoft for businesses with no more than 25 users or 50 devices. It includes Windows Server, Microsoft Exchange Server, Exchange Server, Window ...

Windows Essential Business Server Windows Essential Business Server 2008 (code named ''Centro'') was Microsoft's Server (computing), server offering for mid-size businesses (up to a maximum of 300 Users and/or Devices). It was released to manufacturing on 15 September 2008 and wa ...

(discontinued) *Azure Stack HCI (an edition of Windows Server 2019 and later)

Semi-Annual releases (discontinued)

Following the release of Windows Server 2016, Microsoft attempted to mirror the lifecycle of Windows 10 in the Windows Server family, releasing new versions twice a year which were supported for 18 months. These semi-annual versions were only available as part of Microsoft subscription services, including Software Assurance, Azure Marketplace, and

Visual Studio Visual Studio is an integrated development environment (IDE) developed by Microsoft. It is used to develop computer programs including web site, websites, web apps, web services and mobile apps. Visual Studio uses Microsoft software development ...

subscriptions, until their discontinuation in July 2021. The semi-annual releases do not include any desktop environments. Instead, they are restricted to the Nano Server configuration installed in a Docker

container A container is any receptacle or enclosure for holding a product used in storage, packaging, and transportation, including shipping. Things kept inside of a container are protected on several sides by being inside of its structure. The term ...

, and the Server Core configuration, licensed only to serve as a container host. Semi-Annual releases include: *Windows Server, version 1709 (unsupported as of ) *Windows Server, version 1803 (unsupported as of ) *Windows Server, version 1809 (unsupported as of ) *Windows Server, version 1903 (unsupported as of ) *Windows Server, version 1909 (unsupported as of ) *Windows Server, version 2004 (unsupported as of ) *Windows Server, version 20H2 (unsupported as of )

Annual releases

The Annual Channel was first announced in July 2023, with the first version being released on September the same year. Unlike the Semi-Annual releases, each Annual Channel release would receive six months of extended support in addition to the 18 months of regular support. Annual releases are made available every twelve months, hence the name. Datacenter is the only edition available. Annual releases include: *Windows Server, version 23H2

References

External links

* {{Microsoft Windows family Windows NT

Server Server may refer to: Computing *Server (computing), a computer program or a device that provides requested information for other programs or devices, called clients. Role * Waiting staff, those who work at a restaurant or a bar attending custome ...