Unless you've been hibernating for the last five years, you may have noticed one of the most dramatic shifts to the technology landscape: Microsoft, once the most valuable (and probably the most powerful) company in the world, is now just another tech company. A big tech company, for sure, but one that is being increasingly marginalized by the shift away from the desktop PC and companies such as Apple, Google, and Samsung. If you need proof -- if you're desperately holding onto the belief that the PC will persevere -- just take a look at the following graphs that illustrate the demise of the PC.