1. Microsoft First Operating system was MS DOS launch in 1981 with IBM PC.
2. 2nd Operating system was Windows 1.0 that was launch in 1985.
3. 3rd operating system launched in 1987 name MS Windows 2.0 & 2.11.
4. Windows 3.0 launch in 1990 & Windows NT launched in 1993.
5. Windows 95 launched 1995.
6. Windows 1998 and 2000 were launched in 1998 to 2000
7. 2001 was the golden year in IT industry because Microsoft launched its latest Fully Functional Operating System WINDOWS XP.
8. In 2006 Microsoft introduced Windows Vista.
9. In 2011 Microsoft launched windows 7 with inbuilt Wireless Technology.
10. In 2012 we are using tablet with built in windows 8 mean a touch sensitive Operating system.
2013 Microsoft launch a higher version of windows 8 is windows 8.1.
11. In 29 July 2015 we received a new operating system windows 10.
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