I doubt if Microsoft would agree with your search numbers. Can you provide some accepted industry source? At any rate, if you want to switch search engines, it's trivial:

http://duckduckgo.com/

http://bing.com/

http://yahoo.com/

Let me know how easy it is to get enterprise to switch off the Office document formats or off of Windows.

As for tablets, sales do matter. The Kindle Fire sold around 5.5 million units. Android will be a strong player.