List of Windows operating systems

Xenix (licensed version of Unix; sold to SCO in '90s)
MSX-DOS (developed by MS Japan for the MSX 8-bit computer)
MS-DOS (developed jointly with IBM, versions 1.0–6.22)
Windows CE (OS for handhelds, embedded devices, and real-time applications that is similar to other versions of Windows)
Windows CE 3.0
Windows Mobile (based on Windows CE, but for a smaller form factor)
Windows CE 5.0
Microsoft Windows
Windows 1.0
Windows 2.0
Windows 3.0 (the first version to make substantial commercial impact)
Windows 3.1x
Windows 3.2 (Chinese-only release)
Windows 95 (aka Windows 4.0)
Windows 98 (aka Windows 4.1)
Windows 98 Second Edition (often shortened to Windows 98 SE) (aka Windows 4.2)
Windows Millennium Edition (often shortened to Windows Me) (aka Windows 4.9, not 4.3 due to the version number)
OS/2 (developed jointly with IBM)
Windows NT
Windows NT 3.1
Windows NT 3.5
Windows NT 3.51
Windows NT 4.0
Windows 2000 (aka Windows NT 5.0)
Windows XP (aka Windows NT 5.1) (codename: Whistler)
Windows Server 2003 (aka Windows NT 5.2)
Windows Vista (aka Windows NT 6.0) (codename: Longhorn)
Windows Server 2008 (Uses Windows NT 6.0 base)
Windows Fundamentals for Legacy PCs
Windows Vienna (codename)
WinPE



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