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- Windows 1.0 (November 20, 1985): The first version of Microsoft Windows, it was a 16-bit graphical operating system initially named “Interface Manager”. Key differentiating feature was its Graphical User Interface (GUI) which was a significant shift from the previous command-line MS-DOS system.
- Windows 2.0/ 2.1x (December 9, 1987 and May 27, 1988 respectively): Introduced more sophisticated GUI improvements, overlapping windows and VGA graphics. It was the first Windows version that could run Microsoft Word and Excel.
- Windows 3.0/ 3.1x ( May 22, 1990 and April 6, 1992 respectively): These versions introduced improved memory management, better performance, and significantly enhanced GUI. Windows 3.0 was the first to see extensive popularity and success.
- Windows NT 3.1 (July 27, 1993): A new, completely 32-bit version, was intended for professional applications and advanced users. It was much more stable than the DOS-based Windows and had better memory management.
- Windows 95 (August 24, 1995): A monumental leap forward in Windows’ history introducing a completely redesigned GUI with a Start button, taskbar, and built-in Internet support with Internet Explorer.
- Windows 98 (June 25, 1998): An upgrade to Windows 95, it provided better USB support and a few other enhancements like the Quick Launch toolbar. Windows 98 SE (Second Edition) added Internet Connection Sharing and Internet Explorer 5.
- Windows 2000 (February 17, 2000): Aimed at the professional market, it had improved networking, security features, and support for many peripheral devices. It was more stable than the previous Windows 98.
- Windows ME (Millennium Edition, September 14, 2000): The last Windows in the Win9x series, it was targeted at home users and removed “real mode” DOS support but was often criticized for stability issues.
- Windows XP (October 25, 2001): Combining the strengths of both Windows 2000 and the Windows 9x series, this robust, user-friendly and greatly popular version helped cement Windows’ dominance in the operating system arena.
- Windows Vista (January 30, 2007): Delivered a new graphical user interface named Aero, enhanced security and networking support but had a high system requirement and was criticized for poor performance on older hardware.
- Windows 7 (October 22, 2009): A well-received upgrade from Vista, it presented features like improved taskbar, touch, speech, and handwriting recognition, virtual hard disk support, and performance improvements.
- Windows 8 (October 26, 2012): Introduced a touch-optimized Windows shell based on Microsoft’s “Metro” design language which was a drastic departure from previous versions, causing mix receptions.
- Windows 8.1 (October 17, 2013): A free update to Windows 8 addressed some of the UI issues, introducing more familiar elements like a Start Button, along with security enhancements.
- Windows 10 (July 29, 2015): Merged the touch capabilities of Windows 8 with the familiarity of previous versions. It introduced a universal application architecture, Cortana, Microsoft Edge, and promised continuous updates instead of entirely new versions.