1982 - Microsoft - MS-DOS 1.25
1983 - Microsoft - MS-DOS 2.0
1983 - Microsoft - MS-DOS 2.11
1984 - Apple - Macintosh System Software / System 1
1984 - Microsoft - MS-DOS 3.0
1984 - Microsoft - MS-DOS 3.1
1985 - Apple - Macintosh System Software 0.3 / 0.5 / System 2
1985 - Microsoft - Windows 1
1986 - Apple - Macintosh System Software 0.7 / System 3
1986 - Microsoft - MS-DOS 3.2
1987 - Apple - System Software 2.0 / System 4
1987 - Apple - System Software 5
1987 - Microsoft - Windows 2
1987 - Microsoft - MS-DOS 3.3
1988 - Apple - System Software 6
1988 - Microsoft - MS-DOS 4.0
1990 - Microsoft - Windows 3
1991 - Apple - System 7 / Mac
OS 7 (from 7.6, released in 1997)
1991 - Microsoft - MS-DOS 5.0
1993 - Microsoft - MS-DOS 6.0
1993 - Microsoft - MS-DOS 6.20
1993 - Microsoft - Windows NT
1994 - Microsoft - MS-DOS 6.21
1994 - Microsoft - MS-DOS 6.22
1995 - Microsoft - Windows 95
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1998 - Microsoft - Windows 98
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1999 - Microsoft - Windows 2000
2000 - Microsoft - Windows Me
2001 - Apple - Mac OX X v10.0 (Cheetah)
2001 - Apple - Mac OX X v10.1 (Puma)
2001 - Microsoft - Windows XP
2002 - Apple - Mac OX X v10.2 (Jaguar)
2003 - Apple - Mac OX X v10.3 (Panther)
2005 - Apple - Mac OX X v10.4 (Tiger)
2006 - Microsoft - Windows Vista
2007 - Apple - Mac OX X v10.5 (Leopard)
2009 - Apple - Mac OX X v10.6 (Snow Leopard)
2009 - Microsoft - Windows 7
2011 - Apple - Mac OX X v10.7 (Lion)
2012 - Apple - OX X 10.8 (Mountain Lion)
2009 - Microsoft - Windows 8
2013 - Apple - OX X 10.9 (Mavericks)
2014 - Apple - OX X 10.10 (Yosemite)
2015 - Apple - OX X 10.11 (El Capitan)
2015 - Microsoft - Windows 10
2016 - Apple - macOS 10.12 (Sierra)
2017 - Apple - macOS 10.13 (High Sierra)
2018 - Apple - macOS 10.14 (Mojave)
2019 - Apple - macOS 10.15 (Catalina)
2020 - Apple - macOS 11 (Big Sur)
2021 - Apple - macOS 12 (Monterey)
2021 - Microsoft - Windows 11
2022 - Apple - macOS 13 (Ventura)
2023 - Apple - macOS 14 (Sonoma)
2024 - Apple - macOS 15 (Sequoia)
2025 - Apple - macOS 26 (Tahoe)