Microsoft Windows
Proprietary operating system by Microsoft, dominant on desktops since the 1990s.
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Microsoft Windows is a proprietary operating system developed by Microsoft, first released on November 20, 1985, as Windows 1.0. This initial version served as a graphical operating system shell for MS-DOS, created in response to the rising popularity of graphical user interfaces (GUIs). The name "Windows" derives from the windowing system central to such interfaces.
The product line has since expanded into several families tailored to different computing sectors: Windows for personal computers, Windows Server for servers, and Windows IoT for embedded systems. Within the consumer and corporate family, further editions exist—Home for typical users, Professional for advanced needs, Education for schools, and Enterprise for large organizations. Windows is sold both directly to consumers and to computer manufacturers, who bundle it with their hardware.
The 1990 release of Windows 3.0 significantly boosted the platform's market success, leading to the creation of other product families, including the now-defunct Windows Mobile, Windows Phone, and Windows CE/Embedded Compact. All current Windows families are based on the Windows NT kernel, starting with Windows NT 3.1, which was originally designed for servers and corporate workstations. The modern sub-families—Windows (unqualified), Windows Server, Windows IoT, and Windows PE (a lightweight live operating system for installation and recovery)—are released almost simultaneously and share the same kernel.
Older families, such as the MS-DOS-based versions (Windows 1.0 through Windows Me) and the mobile-focused Windows Mobile and Windows Phone, are no longer actively developed. Windows remains the most popular desktop operating system globally, holding a 71% market share, and is the second-most popular overall after Android. As of July 2026, Windows 11 is the most used desktop version, with a 69% market share.
Lore & Background
The first version of Windows, Windows 1.0, was released on November 20, 1985 as a graphical extension for MS-DOS. Microsoft released Windows 95 on August 24, 1995, featuring pre-emptive multitasking, a completely new user interface with a novel start button, and 32-bit compatibility.
On October 25, 2001, Microsoft released Windows XP, unifying the mainstream and NT lines of OS under the NT codebase. The company released Windows 3.0 on May 22, 1990, featuring streamlined user interface graphics and improved protected mode capability for the Intel 386 processor. Windows 95 quickly became a success, backed by what The New York Times called 'the splashiest, most frenzied, most expensive introduction of a computer product in the industry's history.'
Reader's Guide
Microsoft Windows has been the dominant operating system in the IBM PC–compatible market since the 1990s. Its significance lies in its role in popularizing graphical user interfaces for personal computers, starting with Windows 1.0 in 1985 and achieving broad commercial success with Windows 3.0 in 1990. Windows is sold both as a consumer retail product and to computer manufacturers, who bundle and distribute it with their systems.
The product line has expanded into multiple families—Windows for personal computers, Windows Server for servers, and Windows IoT for embedded systems—each with editions tailored to different users, such as Home, Professional, Education, and Enterprise. Its legacy includes the transition from MS-DOS-based versions to the Windows NT kernel, which now underpins all active Windows families. Windows' main competitors are macOS and Linux for personal computers, and iPadOS and Android for tablets.
Did You Know?
- Windows 1.0 was released on November 20, 1985, as a graphical extension for MS-DOS, despite Microsoft having begun jointly developing OS/2 with IBM that same August.
- In March 2004, the European Union brought antitrust legal action against Microsoft, resulting in a judgment of €497 million ($613 million) and requiring new versions of Windows XP without Windows Media Player.
Frequently Asked Questions
Who is Microsoft Windows?
Microsoft Windows is a proprietary operating system created by Microsoft that runs on personal computers, servers, and embedded devices. It is organized into distinct product families—Windows for PCs, Windows Server, and Windows IoT—each tailored to a specific computing niche.
What families does Microsoft Windows belong to?
Windows is split into three main product lines: the consumer/PC line (e.g., Windows 11), the server line (Windows Server), and the embedded line (Windows IoT). Each family shares the same underlying kernel heritage but is tuned for different hardware and usage scenarios.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Microsoft Windows (CC BY-SA 4.0).
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