Who knows why Wall Street reacts as they react. Share prices have little to do with reason IMO. Theoretically they should reflect anticipated future performance. And in this context I find it interesting that Nokia shares fall very significantly today after they spiked yesterday. Yesterday's news was a shift in strategy (Wall Street likes). Today's news is the tie up between Nokia and Microsoft (Wall Street does not like, neither do I ).

Elop has a lot of explaining to do.

But no one should read too much into a short term fluctuation of a stock.