Windows 1.0
Preliminary name Interface Manager, Window Manager
Official release date November 20, 1985

The very first version of Windows, Microsoft's graphical environment for MS-DOS. It is often overlooked due to support for the platform being extremely miniscule at this stage, but you might be stunned by some of its capabilities that could've reached general availability, including a high color multimedia encyclopedia program.

The earliest leaked build of Windows 1.0
Alpha release of Windows 1.0, includes programs specifically for rendering shapes
Beta release of Windows 1.0, introduces a splash screen and color support
Windows 1.0 Premiere Edition, possibly used for promoting Windows before release
All the versions of Windows 1.0 made available to end users through retail packages or OEM bundles

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