A brutal warning to tech firms and investors

Just over five years ago, on 29 June 2007, the first iPhones went on sale in the US.

The incredible success of this touchscreen smartphone helped catapult Apple (NAS: AAPL) to become the world's largest technology business by market value. Last night, Apple shares closed at over $599, valuing the iconic firm at over $560 billion (£358 billion).