Source: 9 to 5 Mac
quote: Now Microsoft is trying to take the concept one step further with Windows 8 and supporting applications to make the concept information centric, not even document centric. We'll just have to see if this model is accepted
quote: Apple typically supports at least three generations back and in the case of the iPhone, currently back four generations with limited support for some functions due to hardware limitations.
quote: Siri was in Beta for awhile, where Apple did not want to have all of their back products using it until it was ready to bring to everyone.