Currently Windows is the most used operating system in the world. Microsoft has developed many versions of Windows from the MSDOS era to now. AnonyViet has compiled List of 10 best Windows versions. But historically, there have been versions of Windows that did not exist or were not developed at all, even though they were part of Microsoft’s plans.
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In fact, since the first version of Windows, many decades have passed, as well as resounding successes and failures for this particular company. Surely most of you remember that famous versions like Windows XP and Windows 7 have really disappeared. On the contrary, there are also Windows versions that are not well received by everyone such as Windows Vista, Windows ME, Windows 8… In this article, I will introduce some versions that Microsoft included in the development plan but were eventually canceled. These are called non-existent versions of Windows.
Windows Cairo
This is a version of the operating system Microsoft announced in 1991 and codenamed Cairo. The company then embarked on development in 1992, work in which it was involved until 1995. However, despite all the efforts that were put into the project, it was eventually cancelled.
But not all the work was in vain, since part of its features were transferred to other projects, such as happened later with Windows NT 4.0created on the basis of Windows Cairo.
Windows Nashville
We can also mention Windows Nashville, an operating system that was originally created for Windows 98, and based on Windows 95. In fact, Windows Nashville is planned to be the second system in a suite of Windows 9x versions, all based on the 4.10 kernel. Such a project began during 1995 and was due to launch the following year. But it eventually faded into oblivion, although parts of it became part of Windows 98, among other projects.
Windows Neptune
Surely many of you also remember at the same time Windows NTone of Microsoft’s major changes. When talking about Neptunewe are talking about the first version of Windows NT for personal users. Development process of Windows Neptune was made from 1998 to 1999, and its launch was planned for 2001. But this unfortunately did not have good results, because at the beginning of 2000 this Windows was canceled and it participated in the Odyssey project, all this is the foundation of Windows XP mythology that we have used before.
Windows Odyssey
For those of you who don’t know, Windows Odyssey laid the foundation for development Windows 2000. Development process of Windows Odyssey was made in parallel with Windows Neptune, but both were eventually canceled. But not everything is unusable, like in the previous case, Odyssey Finally, part of the features are still included Windows XP. Therefore, as we can see, although some of the projects to develop this version of Microsoft’s operating system never appeared, they were included, part of very important later projects.
Longhorn Windows
This was one of Microsoft’s most anticipated projects at the time. This is planned to be a small update for Windows XP. When implementing this project there were many errors, so the first tests were not very stable and therefore Microsoft did not officially release this version. The company made the decision to refocus development in 2004 and canceled Longhorn. Ultimately, this project was named like that until the project was discontinued and was named “Windows Vista”.
Windows Blackcomb
Windows “Blackcomb” was initially announced as the successor to Windows XP. As Microsoft was finalizing the feature set, they realized they could not achieve the expected release date and started working on a smaller release, which was Windows Longhorn. This delayed Blackcomb until around 2003 or 2004. By mid-2003, Longhorn had acquired many of the features originally intended for Blackcomb.
When Microsoft announced the cancellation of Longhorn Server at the end of 2002, the name Blackcomb also passed away forever.
There is no Preview (trial experience) written under the name Windows “Blackcomb”. In early 2006, as Windows Vista was being finalized, Blackcomb was renamed Vienna with the intention of introducing a new set of codenames derived from famous cities and locations. Finally, the project is canceled and replaced with a new project code named “Windows 7”.
If you want Download for trial installation Windows versions do not exist above, you can download them here winworldpc page.
Frequently asked questions
What is Windows Cairo and why hasn’t it been released?
Windows Cairo was an operating system version developed by Microsoft in 1992 but canceled in 1995. Some of its features were integrated into Windows NT 4.0.
How many unreleased versions of Windows are mentioned in the article?
The article mentions 6 versions of Windows that have never been released: Cairo, Nashville, Neptune, Odyssey, Longhorn and Blackcomb.
Where can I find information about unreleased versions of Windows?
The article refers to the website winworldpc.com as a resource to learn more about these versions.















