Who would have thought 10 years ago that Apple ($AAPL), then valued at an $8 billion market cap, would meet, then exceed Microsoft's ($MSFT) $200 billlion market cap by 2011?
We could say so many things about Apple's historic transformation from tech also-ran to re-emergent industry leader in that time. You could also write a book describing Microsoft's eroding dominance and its stagnating shareholder returns in the post-PC world.
Or we could just look at the chart above and know that a picture is worth a thousand words.