Microsoft
MS-DOS & Early Microsoft Operating Systems
MS-DOS established Microsoftu2019s early PC operating-system foundation, evolving from 1.x through 6.22 and later DOS components used beneath Windows 95, 98 and Me.
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Microsoft
Windows 95, 98 & Me
The Windows 9x family brought the Start menu, taskbar, Windows Explorer, expanded Plug and Play, USB and FAT32-era consumer PC support.
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Windows 95, 98 & Me
The Windows 9x family brought the Start menu, taskbar, Windows Explorer, expanded Plug and Play, USB and FAT32-era consumer PC support.
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Windows NT through Windows 11
Microsoftu2019s NT line grew from Windows NT 3.1 into Windows 2000, XP, Vista, 7, 8/8.1, 10 and 11, becoming the common architecture for modern Windows desktops.
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Windows Server Family
The server lineage includes NT Server, Windows 2000 Server, Server 2003, 2008, 2012, 2016, 2019, 2022 and 2025, covering Active Directory, Hyper-V, storage, networking and security roles.
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Classic Mac OS: System 1 through Mac OS 9
Classic Macintosh system software evolved from the original 1984 graphical desktop through System 6, System 7, Mac OS 8 and Mac OS 9, spanning Motorola 68k and PowerPC hardware.
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Unix, BSD and Commercial Unix
A historical index covering Research Unix, AT&T System V, BSD branches, Solaris, AIX, HP-UX, IRIX, SCO, Xenix, Ultrix, A/UX, NeXTSTEP and modern Unix-certified systems.
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