Microsoft Windows version history

Microsoft Windows version history
Name	Microsoft Windows
Developer	Microsoft
Released	20 November 1985
First release version	Windows 1.0
Latest release version	Windows 11
Latest release date	5 October 2021
Latest preview version	Windows 11 Insider Preview
Marketing target	Personal computing
License	Proprietary software

Microsoft Windows version history traces the evolution of the dominant operating system for personal computers, beginning in the mid-1980s. Developed by Microsoft, it originated as a graphical user interface atop MS-DOS before evolving into a fully-fledged, multi-architecture OS family. Its development is broadly split into the consumer-focused Windows 9x line and the professional, stable Windows NT lineage, which eventually merged.

Early versions (1985–1992)

The initial release, Windows 1.0, introduced a tiling window manager and applications like Microsoft Paint and Windows Write. Windows 2.0 gained notoriety for enabling overlapping windows, leading to a copyright lawsuit from Apple Inc. against Microsoft. The pivotal Windows 3.0 and its successor Windows 3.1 achieved widespread success by introducing the Program Manager and File Manager, better memory management, and popularizing TrueType fonts. This era also saw the first Windows for Workgroups releases, adding peer-to-peer networking and support for Novell NetWare and Banyan VINES.

Windows 9x series (1995–2000)

This consumer-oriented series, built on MS-DOS, revolutionized the PC market. Windows 95 introduced the seminal Start menu, taskbar, and long VFAT filenames, while Internet Explorer began its integration. Windows 98 enhanced USB support and integrated the Active Desktop with the Windows Shell. The final release, Windows Me (Millennium Edition), focused on multimedia with Windows Movie Maker but was criticized for stability, largely due to its removal of real MS-DOS mode. This line competed directly with IBM's OS/2 Warp.

Windows NT series (1993–present)

Developed separately by a team led by Dave Cutler, formerly of Digital Equipment Corporation, the Windows NT kernel prioritized stability and security for business environments. Early versions like Windows NT 3.1 and Windows NT 4.0 served workstation and server roles. The consumer and professional lines merged with Windows XP, which used the Windows NT kernel to replace the Windows 9x series. Subsequent major releases include Windows Vista, Windows 7, Windows 8, Windows 10, and Windows 11. The server branch produced Windows Server 2003, Windows Server 2008, and Windows Server 2022.

Windows for specific systems

Microsoft developed specialized variants for different hardware architectures and markets. Windows CE powered embedded systems and early Pocket PC devices. For mobile phones, the Windows Mobile and later Windows Phone series used a distinct kernel, featuring the Metro design language. The Xbox gaming consoles run a modified, proprietary version of the Windows NT kernel. For tablet computers and 2-in-1 PCs, versions like Windows XP Tablet PC Edition and touch-centric features in Windows 8 were created.

Version timeline and market impact

Key releases aligned with major shifts in the technology industry. Windows 95's launch was a global media event, accelerating the adoption of IBM PC compatible systems over rivals like Apple Macintosh. Windows XP became one of the longest-serving and most popular versions. The reception of Windows Vista was mixed, while Windows 7 was widely praised. Windows 8's radical interface changes were controversial, leading to a course correction with Windows 10 and its Windows as a service model. The system's dominance attracted major antitrust cases, including United States v. Microsoft Corp.

Development and architecture evolution

The architecture shifted from a 16-bit DOS shell to a hybrid 16/32-bit model in the Windows 9x series, and finally to a pure 32-bit (and later 64-bit) preemptive multitasking kernel with Windows NT. Major programming interfaces evolved from the Windows API to Component Object Model and the .NET Framework. Security models were overhauled post-Windows XP with the introduction of User Account Control in Windows Vista and features like Windows Defender and Secure Boot. Development now occurs largely under the Windows Insider program.

Category:Microsoft Windows Category:History of software