Operating System Beta, etc. Wiki
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The Windows 1.0 User Interface (running the MS-DOS Executive)

Windows 1.0 is (as the name suggests) the first version of Windows released by Microsoft. Windows 1.0 was released to the public in 1985.

Originally, Microsoft started work on a new graphical environment for MS-DOS-based personal computers, known as "Interface Manager". This environment would include support for existing MS-DOS-based applications, as well as GUI applications that were specifically designed for the new environment.

Later, at COMDEX 1983 in November, Microsoft demonstrated a new upcoming product, "Microsoft Windows", running on a personal computer with monochrome graphics, and with various applications running alongside each other in "windows".

During the course of its development, several pre-release versions of Microsoft Windows were also made available to testers and developers, including a "Developer Release 5" from around November 1984, as well as later pre-release versions such as those from 1985-01 (Alpha), 1985-05 (Beta), and Premiere Edition in 1985-07.

A final preliminary release, Premiere Edition (1.00), was released to a group of users for testing Windows prior to its release. Windows 1.01, released on 1985-11-20, was the first version of Windows to be released to general availability, whereas several more versions, Windows 1.02 and Windows 1.03, were released as more changes were made to Windows, up to, 1.04, which was released in 1987-04, the latter of which also added support for the newly introduced IBM PS/2 series of personal computers which was released at that same time.

According to Microsoft, Windows 1.0 is a 16-bit "Operating Environment" designed to run on top of MS-DOS, and is not a standalone operating system. Microsoft would later port many of the technologies developed in Windows to develop a standalone OS called Windows NT.

Several versions in other languages, such as Windows 1.03 in German and French and Windows 1.03 Japanese for the NEC PC-9801, were also released, as well as OEM versions such as a version of Windows 1.01 for Zenith personal computers, as well as versions of Windows 1.03 for Olivetti and Siemens machines.

This also Replaced to Windows 2.0x

Development

Development of Windows started as early as 1983, when Bill Gates felt the danger of rival companies like VisiCorp, which started to make their own graphical systems to handle multi-tasking apps. At first, it was intended to be called Interface Manager, although later the name was changed to Windows. The developement had gone through a reset when the Mac was released. Before it, developers had more-or-less a free hand on how the OS will look. However, once the Mac was available, the task was made clear and simple: "Copy it!".

Builds

Pre-DR5

Buildlist-Red.png Microsoft Interface Manager Internal Test Release #3
Buildlist-Green.png Microsoft Windows "InfoWorld" build
Buildlist-Green.png Microsoft Windows 1.0 Development Release #1
Buildlist-Green.png Microsoft Windows 1.0 Development Release #2
Buildlist-Green.png Microsoft Windows 1.0 Development Release #3
Buildlist-Green.png Microsoft Windows 1.0 Development Release #4

Pre-release

Buildlist-Green.png Microsoft Windows Beta Release
Buildlist-Red.png Microsoft Windows Codename Pegasus Version 0.99
Buildlist-Green.png Microsoft Windows 1.01 RC (10-21)
Buildlist-Green.png Microsoft Windows 1.01 RC (11-14)

RTM

Buildlist-Red.png Microsoft Windows 1.00
Buildlist-Green.png Microsoft Windows 1.01
Buildlist-Green.png Microsoft Windows 1.02
Buildlist-Green.png Microsoft Windows 1.03
Buildlist-Green.png Microsoft Windows 1.03.08
Buildlist-Green.png Microsoft Windows 1.04

MS-DOS Executive Year Date

As you can see, The Year Date by over 1999 (99), Originally it was now 100, Similar as 2000.
Following as year date shows included over 100:

  • 2000 = 100
  • 2001 = 101
  • 2002 = 102
  • 2003 = 103
  • 2004 = 104
  • 2005 = 105
  • 2006 = 106
  • 2007 = 107
  • 2008 = 108
  • 2009 = 109
  • 2010 = 110
  • 2011 = 111
  • 2012 = 112
  • 2013 = 113
  • 2014 = 114
  • 2015 = 115
  • 2016 = 116
  • 2017 = 117
  • 2018 = 118
  • 2019 = 119
  • 2020 = 120
  • 2021 = 121
  • 2022 = 122
  • 2023 = 123
  • 2024 = 124

Trivia

Did you know...

  • It was the longest supported version of Windows by Microsoft? It was supported for 16 years, until 2001-12-31
  • When Windows 1.0 tries to show a date later than 2000, it actually shows it as 100? Similarly, 2019 -> 119 (on MS-DOS Executive)
  • This is the only OS by Microsoft to not have overlapping windows on the desktop, this was due to Apple copyrighting the overlapping windows UI
And... IT'S JUST NINETY-NINE DOLLARS!
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