"But the biggest disappointment was Apple's No. 1 revenue driver: the iPhone. The tech giant said it sold 26 million iPhones during the quarter -- a steep drop-off from previous quarters.... Wall Street analysts had been expecting about 29 million of the smartphones to be sold." (http://money.cnn.com/2012/07/24/technology/apple-earnings/index.htm?hpt=hp_t2)
Shares of Apple fell 5%.
This is hardly a crisis. CNN calls Apple the world's most valuable company. But it is a problem when analysts are overly optimistic and your company doesn't live up to their forecasts. Apple needs to emphasize its conservative internal predictions to the investment community to be sure its voice is heard. Nevertheless, that 5% slip is probably a blip, not a trend.