I have used almost each and every variant of Microsoft Windows including MS DOS, Windows 95 and Windows 98. However, two of the standout operating systems from Microsoft have been Windows XP and Windows 7. Windows Vista was an ok OS too, but it did have a lot of problems.
Windows XP was launched in August 2001, however, it still commands a huge market share in the PC market. Windows 7 though has been the fastest selling OS in history with it selling over 150 million copies in a very short time.
Ironically, Windows 7 did not compete with Windows Vista for market share, but did it with a 10 year old OS in the form of Windows XP. The reason being that many corporates are not yet ready to switch from Windows XP. I still find that many offices continue to use Windows XP as their primary operating system.
Microsoft though will be happy with the news that Windows 7 has finally managed to take over Windows XP as the top Windows operating system in United States. This data was generated through reports from StatCounter by Royal Pingdom for visitors to over 3 million websites.
Windows 7 now has a marginal advantage over Windows XP in U.S. This is bound to grow in future with more users buying new laptops and desktop PCs and dumping their older ones. Also, most of the newer Windows based tablets run some variants of Windows 7, so that might add to this number in future.
Overall, Windows XP has definitely been one of the best operating system from Microsoft. The fact that it still holds more than 31% of the market share after 10 years says a lot about it.
Microsoft has been mulling to remove support for Windows XP for a long time now, but they still continue to support it. However, Microsoft has been culling off major software support for the OS by not adding XP support for Windows Live Wave 4 and Internet Explorer 9. However, Windows XP still continues to dominate the operating system wars. Unlike IE6, this baby is a long way from becoming extinct.