MaximumPC said:Believe it or not, Microsoft’s Windows is 25 years old - which is certianly making some of us feel old. Despite a few ups and downs, growing pains, and BSODs, Windows has survived the test of time and continues to reign as one of the most popular operating systems available today. Of course that’s not to say there haven’t been other operating systems over the years that tried to steal the crown; in fact, there have been quite a few. Here’s a look at some of the biggest contenders Windows has had to overcome to get where it is today.
11 OSes that Tried (and failed) to Take Down Windows | Maximum PC
http://www.maximumpc.com/article/features/11_oses_tried_and_failed_take_down_windows