When you think of it, companies such as Microsoft do not get to be the size it is by just selling software and operating systems. The company has to grow and in order to get to the level that we see Microsoft at moment this means taking over other businesses.
So you think that you know about Microsoft, well check this info graphic out by Robin Richards at Ripe Tungi to see exactly how the company has grown and what other businesses have been assimilated. This design is brilliant it looks like any old metro or underground train map, but in reality, it is a record of Microsoft acquisitions and each colour represents a different industry, it is very interesting.
Source [Cool Info Graphics]