Question: What is the oldest version of microsoft windows?

Disambiguated questions and answers:
context: No context provided
question: What was the first ever version of Microsoft Windows?
short_answers: 1.0
context: In 1993, Microsoft released Windows NT 3.1, the first version of the newly-developed Windows NT operating system. Unlike the Windows 9x series of operating systems, it is a fully 32-bit operating system. NT 3.1 introduced NTFS, a file system designed to replace the older File Allocation Table (FAT) which was used by DOS and the DOS-based Windows operating systems. In 1996, Windows NT 4.0 was released, which includes a fully 32-bit version of Windows Explorer written specifically for it, making the operating system work just like Windows 95. Windows NT was originally designed to be used on high-end systems and servers, however with the release of Windows 2000, many consumer-oriented features from Windows 95 and Windows 98 were included, such as the Windows Desktop Update, Internet Explorer 5, USB support and Windows Media Player. These consumer-oriented features were continued and further extended in Windows XP, which introduced a new theme called Luna, a more user-friendly interface, updated versions of Windows Media Player and Internet Explorer, and extended features from Windows Me, such as the Help and Support Center and System Restore. Windows Vista focused on securing the Windows operating system against computer viruses and other malicious software by introducing features such as User Account Control. New features include Windows Aero, updated versions of the standard games (e.g. Solitaire), Windows Movie Maker, and Windows Mail to replace Outlook Express. Despite this, Windows Vista was critically panned for its poor performance on older hardware and its at-the-time high system requirements. Windows 7 followed two and a half years later, and despite technically having higher system requirements, reviewers noted that it ran better than Windows Vista. Windows 7 also removed many extra features, such as Windows Movie Maker, Windows Photo Gallery and Windows Mail, instead requiring users download a separate Windows Live Essentials to gain those features and other online services. Windows 8 and Windows 8.1, a free upgrade for Windows 8, introduced many controversial changes, such as the replacement of the Start menu with the Start Screen, the removal of the Aero glass interface in favor of a flat, colored interface as well as the introduction of "Metro" apps (later renamed to Universal Windows Platform apps) and the Charms Bar user interface element, all of which received considerable criticism from reviewers.
question: What was the first version of Windows that was its own operating system?
short_answers: Windows 95
wikipage: Microsoft Windows version history
context: In 1993, Microsoft released Windows NT 3.1, the first version of the newly-developed Windows NT operating system. Unlike the Windows 9x series of operating systems, it is a fully 32-bit operating system. NT 3.1 introduced NTFS, a file system designed to replace the older File Allocation Table (FAT) which was used by DOS and the DOS-based Windows operating systems. In 1996, Windows NT 4.0 was released, which includes a fully 32-bit version of Windows Explorer written specifically for it, making the operating system work just like Windows 95. Windows NT was originally designed to be used on high-end systems and servers, however with the release of Windows 2000, many consumer-oriented features from Windows 95 and Windows 98 were included, such as the Windows Desktop Update, Internet Explorer 5, USB support and Windows Media Player. These consumer-oriented features were continued and further extended in Windows XP, which introduced a new theme called Luna, a more user-friendly interface, updated versions of Windows Media Player and Internet Explorer, and extended features from Windows Me, such as the Help and Support Center and System Restore. Windows Vista focused on securing the Windows operating system against computer viruses and other malicious software by introducing features such as User Account Control. New features include Windows Aero, updated versions of the standard games (e.g. Solitaire), Windows Movie Maker, and Windows Mail to replace Outlook Express. Despite this, Windows Vista was critically panned for its poor performance on older hardware and its at-the-time high system requirements. Windows 7 followed two and a half years later, and despite technically having higher system requirements, reviewers noted that it ran better than Windows Vista. Windows 7 also removed many extra features, such as Windows Movie Maker, Windows Photo Gallery and Windows Mail, instead requiring users download a separate Windows Live Essentials to gain those features and other online services. Windows 8 and Windows 8.1, a free upgrade for Windows 8, introduced many controversial changes, such as the replacement of the Start menu with the Start Screen, the removal of the Aero glass interface in favor of a flat, colored interface as well as the introduction of "Metro" apps (later renamed to Universal Windows Platform apps) and the Charms Bar user interface element, all of which received considerable criticism from reviewers.
question: What was the first version of Windows that was a fully 32 bit operating system?
short_answers: Windows NT 3.1
wikipage: Microsoft Windows version history

Long-form answers:
knowledge: content: The first independent version of Microsoft Windows, version 1.0, released on November 20, 1985, achieved little popularity.
wikipage: Microsoft Windows version history
content:  After Windows 3.11, Microsoft began to develop a new consumer-oriented version of the operating system codenamed Chicago. Chicago was designed to have support for 32-bit preemptive multitasking like OS/2 and Windows NT, although a 16-bit kernel would remain for the sake of backward compatibility. 
Microsoft marketing adopted Windows 95 as the product name for Chicago when it was released on August 24, 1995. 
wikipage: Microsoft Windows version history
long_answer: The first-ever version of Microsoft Windows was Microsoft Windows 1.0 and was released in 1985. In 1993, Microsoft released Windows NT 3.1, the first version of the newly-developed Windows NT operating system with a fully 32-bit operating system. Microsoft began to develop a new consumer-oriented version of the operating system codenamed Chicago. Microsoft marketing adopted Windows 95 as the product name for Chicago when it was released in 1995. 
knowledge: content: Windows 1.0 is a graphical operating environment for personal computers, developed by Microsoft.
wikipage: Windows 1.0x
content: Microsoft released Windows 1.0 on November 20, 1985, as the first version of the Microsoft Windows line.
wikipage: Windows 1.0x
content: Windows 95, though still being based on MS-DOS, was its own operating system, using a 16-bit DOS-based kernel[citation needed] and a 32-bit user space.
wikipage: Microsoft Windows version history
long_answer: Windows 1.0 was a graphical operating environment for personal computers, developed by Microsoft, and was released on November 20, 1985, as the first version of the Microsoft Windows line. In 1993, Microsoft released Windows NT 3.1, the first version of the newly-developed Windows NT operating system and it was a fully 32-bit operating system. Windows 95, though still being based on MS-DOS, was its own operating system, using a 16-bit DOS-based kernel and a 32-bit user space.