Windows has evolved over 9 major versions since its introduction in 1985. It started as a graphical shell on top of MS-DOS and is now a full-fledged operating system. Key developments include the introduction of a GUI in Windows 1.0 in 1985, the move to 32-bit multitasking in Windows 95 in 1995, and the return of the Start button and integration of Cortana in Windows 10 in 2015. Windows has remained the dominant desktop operating system, holding around 90% of the market share in 2016.

1. Evolution of Windows
Babu Jayaraj

2. Foundation
Microsoft was founded by Paul Allen and Bill Gates on April 4, 1975, to develop and sell
BASIC interpreters for the Altair 8800.
MS-DOS was the standard operating system for IBM compatible personnel computers
developed by Microsoft. The Initial versions of DOS were very simple and resembled
another operating systems called CP/M
1975

3. Microsoft Windows has been seen 9 major versions since its first
release in 1985
Over 29 years later, windows looks very different but somehow familiar with
elements that have survived the test of time, increases in computing power and –
most recently a shift from the keyboard and mouse to the touchscreen.
Here's brief look at the history of windows, from its birth at hands of Bill Gates
with windows 1 to the latest arrival under new Microsoft CEO Satya Nadella

4. MS-DOS
• Microsoft Disk Operating System
• Command-line interface (CLI)
August
1981
Microsoft quickly
bought the rights to 86-
DOS from Seattle
Computer Products, and
began work on
modifying it to meet
IBM's specification

5. Windows 1.0
• First True attempt at a GUI in 16 bit
• Multitasking shell on top of an existing MS-
DOS installation
20th
November
1985
The development was
fully leaded by founder
Bill Gates

6. Windows 2.0
9th
December
1987
• Allows application windows to overlap and it also
introduced ability to minimize or maximize
• First version to integrate the control panel
Microsoft Word and
Excel also made their
first appearances

7. Windows 3.0
22nd
May
1990
• Protected/Enhanced mode to run Windows
applications with reduced memory issues
• Better memory management
Supported 256 colours
display bringing a more
modern, colourful look to
the interface .

8. Windows NT
27th
July
1993
• MS-DOS Programs to be controlled with mouse for the
first time
• Portability to multiple processor architectures, as well as
higher security and stability
First windows Operating
System distributed on
CD-ROM,

9. Windows 95
24th
August
1995
• Moved to multitasked 32-bit architecture
• Introduced the taskbar, the 'Start' button, and
the way the user navigates
Internet Explorer and
Outlook Express also
made its debut

10. Windows 98
25th
June
1998
• Improved power management, network
management, and USB support
• Added Standby and Hibernate modes for better
power management
USB Mouse and USB
HUBS supports also
included

11. Windows 2000
17th
February
2000
• Added NTFS (New Technology File System) 3.0, Microsoft
Management Console (MMC), and the Encrypting File
System (EFS)
• Also Active Directory, File & Printer Server, Application
Server and Web server
A number of new
assistive technologies to
support for people with
disabilities were
introduced.

12. Windows ME
14th
September
2000
• Introduced a System Restore feature, and
improved digital media and networking tools
• Restricted access to real mode MS-DOS
Criticized for speed and
stability issues, a PC
World article dubbed
Windows ME the
"Mistake Edition“
(Very short shelf-life)
Millennium

13. Windows XP
25th
October
2001
• Improved taskbar and ‘Start’ menu, better
networking features
• Windows XP was the longest running
operating system
The first version of
Windows to use product
activation in an effort to
reduce software piracy.

14. Windows Vista
30th
January
2007
• Introduced Windows Search, Windows Aero,
Windows Sidebar, Shadow Copy
• Integrated Speech Recognition
Criticisms of Vista
- high system requirements
- more restrictive licensing
- new digital rights
management
- lack of compatibility with
some pre-Vista hardware
and software

15. Windows 7
22nd
October
2009
• Support for virtual hard disks, better multi-
core processors performance and kernel
• Improved touch and handwriting recognition
It was intended to fix all
the problems and
criticism faced by Vista

16. Windows 8
26th
October
2012
• Heavier integration with online services from
Microsoft and others (Skydrive, Xbox)
• Visualization Hyper-V Introduced
• Faster startup through UEFI integration
User interface focused on
tablets users, including a
touch-optimized shell
using the "Metro" design
language, and a new
'Start' screen
With No ‘Start button

17. Windows 10
29th
July
2015
• Return of ‘Start’ button, a virtual desktop
system, integration with Windows Phone
• Device dependent interface
Incorporates Microsoft's
intelligent personal
assistant called Cortana

18. Desktop Market Share in 2016
90% Window Operating System

19. Thank You