| Years | Description | Reference | 
    
        | 1975 | Microsoft is a startup formed as a partnership of Bill Gates and Paul G. Allen 
            for the desktop computer business. |  | 
    
        | June 1980 | Birth of Microsoft Disk operating system "MS‑DOS" which is a 
            text based software designed for bridging the 
            gap between the hardware and application programs for the operator of desktop 
            computer. MS‑DOS ships in 1981. Versions: 
 
            1981:-MS-DOS 1.01982:-MS-DOS 1.251983:-MS-DOS 2.01984:-MS-DOS 2.11  MS-DOS 3.0  MS-DOS 3.11985:-MS-DOS 2.251986:-MS-DOS 3.21987:-MS-DOS 3.31988:-MS-DOS 4.0  MS-DOS 4.011991:-MS-DOS 5.01993:-MS-DOS 6.0  MS-DOS 6.21994:-MS-DOS 6.21  MS-DOS 6.221995:-MS-DOS 7.0 (Windows 95)1996:-MS-DOS 7.1 (Windows 95 OSR2)2000:-MS-DOS 8.0 (Windows ME) |   __doswin_2.gif) | 
    
        | 1981 | MS-DOS 1.0 |  | 
    
        | 1982 | The difficulty of using the text based MS-DOS causes the need of a better 
            interface between the user and the personal computer. In 1983, the development 
            of Windows is announced. Versions: 
 
            1985:-MS-Windows 1.01987:-MS-Windows 2.01988:-MS-Windows 2.11989:-MS-Windows 2.111990:-MS-Windows 3.01992:-MS-Windows 3.11993:-MS-Windows for Workgroups 3.111993:-MS-Windows NT 3.11994:-MS-Windows NT 3.51995:-MS-Windows NT 3.511995:-MS-Windows 951996:-MS-Windows NT 41998:-MS-Windows 981999:-MS-Windows 98SE2000:-MS-Windows 20002000:-MS-Windows ME2001:-MS-Windows XP2003:-MS-Windows Server 20032005:-MS-Windows XP x86-642007:-MS-Windows Vista2008:-MS-Windows Server 20082009:-MS-Windows 72009:-MS-Windows Server 2008R22012:-MS-Windows 82012:-MS-Windows Server 20122013:-MS-Windows 8.12013:-MS-Windows Server 2012 R22015:-MS-Windows 10last updated 22Aug2016 |   | 
    
        | 1985 | MS-Windows 1.0 |  | 
    
        | 1987 | MS-DOS 3.3 |  | 
    
        | 1987 | MS-Windows 2.0 
 Microsoft Windows/386 or Windows 386 (1988)
 Microsoft Windows/286 or Windows 286 (1988)
 last updated 18May2017
 |   | 
    
        | 1990 | MS-Windows 3.0 
 Microsoft Windows 3.0 or Windows 3.0a with multimedia (1991) 
            last updated 18May2017
 |  | 
    
        | 1992 | MS-Windows 3.1 
 Microsoft Windows for Workgroups 3.1 (1992)
 Microsoft Windows 3.11 (1993)
 Microsoft Windows for Workgroups 3.11 (1994)
 last updated 18May2017
 |  | 
    
        | 1993 | MS-Windows NT 3.1 
 Microsoft changes the name of new OS that not cooperating with OS/2 to Windows 
            NT. (1991)  last updated 18May2017
 |  | 
    
        | 1994 | MS-DOS 6.22 |  | 
    
        | 1994 | MS-Windows NT 3.5 
 Microsoft Windows NT 3.51 (1995)  last updated 18May2017
 |  | 
    
        | 1995 | MS-Windows 95 
 Microsoft Windows 95 Service Pack 1 (4.00.950A) (1995)
 Microsoft Windows 95 (4.00.950B) aka OSR2 with FAT32 and MMX support (1996)
 Microsoft Windows CE 1.0 (1996)
 Windows CE 2.0 (1997)
 Microsoft Windows 95 (4.00.950C) aka OSR2.5 (1997)
 Microsoft Windows CE 2.1 (1998)
 Windows CE 3.0 (1999)
 Windows CE changes to  Pocket PC (2000)
 
 last updated 18May2017
 |   | 
    
        | 1996 | MS-Windows NT 4.0 |  | 
    
        | 1998 | MS-Windows 98 
 Microsoft Windows 98 SE (Second Edition) (1999)
 last updated 18May2017
 |  | 
    
        | 2000 | MS-Windows 2000 |  | 
    
        | 2000 | MS-Windows ME |  | 
    
        | 2001 | MS-Windows XP 
 Microsoft Windows XP 64-Bit edition (Version 2002) for Itanium systems (2001)
 Microsoft Windows XP 64-Bit edition (Version 2003) for Itanium 2 systems (2003)
 Microsoft Windows XP Media Center edition 2003 (2003)
 Microsoft  Windows XP Media Center edition 2005 (2004)
 
 last updated 18May2017
 
 |  | 
    
        | 2003 | MS-Windows Server 2003 |  | 
    
        | 2005 | MS-Windows XP x86-64 |  | 
    
        | 2007 | Microsoft codenamed "Longhorn" changes to Windows Vista (2005) Microsoft Windows Vista to corporations (2006)
 
 last updated 18May2017
 
 MS-Windows Vista
 |  | 
    
        | 2008 | MS-Windows Server 2008 |  | 
    
        | 2009 | MS-Windows 7 |  | 
    
        | 2009 | MS-Windows Server 2008 R2 |  | 
    
        | 2012 | MS-Windows 8 |  | 
        | 2012 | MS-Windows Server 2012 |   | 
    
        | 2013 | MS-Windows 8.1 |    | 
    
        | 2013 | MS-Windows Server 2012 R2 |   .jpg)  | 
    
        | 2015 | MS-Windows 10last updated 22Aug2016 |     | 
    
        | 2016 | MS-Windows 
            Server 2016 last updated 18May2017 |  | 
    
        | 2021 | MS-Windows 11last updated 20Dec2021 |     |