Microsoft unveiled Windows 1.0 for the first time in November 1983, exactly 40 years ago.
In the early 1980s, computer operating systems were command-line based, requiring text-based command inputs. However, a GUI (Graphical User Interface) revolution was underway in the IT industry. Apple led the revolution by introducing Lisa in early 1983. It was one of the first PCs with a graphical user interface, allowing users to open programs and files using a mouse.

To compete with Lisa, Microsoft initiated a GUI operating system project called Interface Manager. Bill Gates announced the development of Windows 1.0 at the Plaza Hotel in New York on November 10, 1983.
When Microsoft unveiled Windows 1.0, the company stated it was an extension of the window management system of MS-DOS. Microsoft expected Windows 1.0 to expand the software development environment of MS-DOS by enabling developers to release more graphically oriented programs. Therefore, the first version of the Windows operating system was more like a supplement to MS-DOS rather than a replacement.
Microsoft showcased the first pre-release version of Windows 1.0 at COMDEX (Computer Dealers' Exhibition) in November 1983. The world saw the Windows operating system on a green screen for the first time 40 years ago. The initial Windows platform allowed users to access multiple running programs by clicking on their icons on a taskbar, similar to today's taskbar.
Windows 1.0 also came bundled with some applications that users are familiar with today. Notepad, Paint, and Calc (Calculator) are three programs bundled with Windows 1.0 and have been part of the operating system line ever since. Users could also select Writer (word processor), Clock, Reversi (board game), Clipboard, and Calendar programs from the MS-DOS Executive shell.

With its inception from Windows 1.0, this operating system has continuously evolved and brought immense success to Microsoft. Today, with billions of computers running various versions of Windows, it remains the world's number one operating system trusted by both individual users and organizations.