The first release version was actually numbered 1.01. It has been rumored that version 1.00 was actually released but quickly pulled due to a severe flaw having to do with keyboard input. However, this rumour has now been fairly conclusively disproven through a number of reliable sources comments on the version history of Windows 1.x. For example, Ben Armstrong's (A program manager for Microsoft's Virtual Machine Technology Team) comments on Windows 1.0:
...few people know that Windows 1.0 was actually never released. Windows 1.0 was the version of Windows that was demonstrated at the '83 Comdex. It would be 14 months until Microsoft eventually released Windows 1.01 - which included some minor bug fixes - to the general public.
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