Windows evolution:
40 years of design, 1985–2026

The table lists each major consumer release, its date and its defining design change.

Table: Major Windows releases and their design changes (Microsoft and Computer History Museum)

Time beginners needed to open a program in Windows 3.1 tests

9.5 min

Rounds of lab testing behind Windows 95's interface

64

Participants in those Windows 95 tests

560

Start button in the bottom-left corner, 1995–2021

26 years

The first versions of Windows had to teach a generation that had typed commands how to point and click. Windows 1.0, released on 20 November 1985, ran on top of MS-DOS and arranged windows in tiles that could not overlap¹. It came with Calculator, Notepad, Paint and the game Reversi.

Windows 2.0 (1987) allowed overlapping windows, and Apple sued in 1988, claiming Microsoft had copied the Macintosh's "look and feel"; Apple lost. Windows 3.0 (1990) was the first big success, with a Program Manager of icon groups and buttons that looked raised. Some icons for Windows 3.0, and the card deck for its Solitaire, were designed by Susan Kare, who had drawn the original Macintosh icons.

Solitaire was not only a game. A Microsoft product manager explained to the Washington Post in 1994 that it helped people who were intimidated by the system and taught them to use a mouse, especially to drag³. Minesweeper, added in Windows 3.1, trained left and right clicking. It is an early example of designing practice into a product rather than writing a manual.

Windows 95 is the textbook case of usability engineering, because its designers published how they built it. In a 1996 paper for the ACM CHI conference, Microsoft's Kent Sullivan described the problems their lab found in Windows 3.1²:

The team ran 64 phases of lab testing with 560 participants. Their answers became the two most familiar elements of any PC: the Start button, a single, always-visible, single-click "home base", and the taskbar, a strip along the bottom with a button for every open window, so windows could never get lost. In the final comparison, people completed the twenty most common tasks in about half the time they needed on Windows 3.1². The launch on 24 August 1995 came with a Rolling Stones advertising campaign set to "Start Me Up".

Why the bottom-left corner?

The corner was the best place on the screen to put the most important button. Fitts's law says the time to reach a target depends on its distance and size. At a screen edge the cursor stops, so a target in a corner behaves as if it were infinitely deep: you can throw the mouse towards it without aiming. Corners are the four easiest targets on any desktop.

Windows XP, released on 25 October 2001, merged the consumer and business versions of Windows and gave them a friendlier face, the blue-and-green "Luna" theme⁴. Its wallpaper, "Bliss", is a film photograph of a hill in southern Sonoma County, California, taken by former National Geographic photographer Charles O'Rear in January 1996. Microsoft bought the rights and it became, by many estimates, the most-viewed photograph in history⁵. XP was so well liked that it was still found on cash machines more than a decade later.

Windows Vista (January 2007) introduced Aero, with translucent glass window borders, and User Account Control prompts that appeared so often people learned to click through them, a classic case of security warnings losing meaning through repetition. Windows 7 (October 2009) fixed much of Vista's reputation and made the taskbar a dock: programs could be pinned and their windows grouped under one icon.

Windows 8 is the clearest example in modern software of removing something people relied on. Released in October 2012 for a world Microsoft expected to be dominated by tablets, it replaced the Start menu with a full-screen grid of "live tiles" and removed the Start button from the desktop taskbar. To reach Start, desktop users had to move the cursor into a hidden hot corner or press the Windows key.

Jakob Nielsen tested it with experienced PC users weeks after launch and titled his report "Windows 8 — Disappointing Usability for Both Novice and Power Users". He found hidden features, confusing switching between two environments and low information density on the tiles⁶. Microsoft added a Start button back in Windows 8.1 in October 2013, and Windows 10 (July 2015) restored a full Start menu with tiles inside it. The lesson is Jakob's law: people expect your product to work like the ones they already use, including your own previous version.

Windows 10 introduced Fluent Design in 2017, with soft translucency ("acrylic") and light effects. Windows 11, announced on 24 June 2021 and released that October, made the most visible change to the shell since 1995: the Start button and taskbar icons moved to the centre, and windows gained rounded corners and a translucent "Mica" material that takes a tint from the wallpaper⁷.

The centred Start suits wide monitors and touchscreens, where the eye and hand rest near the middle. It gave up the corner advantage, so Microsoft kept a setting to move it back to the left. Microsoft ended support for Windows 10 on 14 October 2025⁸. In October 2026 Windows 11 remains current, updated once a year (version 26H2 is the autumn 2026 release), and Microsoft has not announced a Windows 12⁹.

• Test with beginners, not just experts — the Windows 95 team found its biggest problems by watching people who had never used Windows.
• Make the most common task one click from anywhere — the Start button solved "open a program", the top task, at every moment.
• Never let things disappear — the taskbar exists because people thought hidden windows were gone.
• Use the screen's edges — corners and edges are the fastest targets; put primary controls there on desktop software.
• Don't remove a habit without a bridge — Windows 8 forced a new model on people; 8.1 and 10 had to give the old one back.

For teams changing a familiar interface, a SaaS UX audit applies the same method as Microsoft's 1990s lab on a smaller scale: watch real users try the top tasks before and after.

Release dates come from Microsoft's announcements and the Computer History Museum's timeline. The Windows 95 findings are quoted from Kent Sullivan's CHI 1996 design briefing, published by the ACM. Windows 8 findings come from Jakob Nielsen's 2012 study. Screenshots are from Wikimedia Commons, where they are tagged public domain, with credits under each; current Windows screens are not reproduced because they are copyrighted. Last reviewed October 2026.