Nvidia has handed back the position as the world's most valuable company to Microsoft after its share price fell by more than 3.5% on Thursday. The artificial intelligence (AI) chip giant briefly held the top spot from Tuesday, with a stock market valuation of 3.34tn ( 2.64tn). But Nvidia's shares fell to 130.78 on Thursday, sending its value down to around 3.22tn, with Microsoft reclaiming the title as it held steady at more than 3.3tn. Nvidia's rise has been fuelled by its dominance of what analysts call the "new gold or oil in the tech sector" - the chips that power AI. Nvidia, Microsoft and Apple - each worth more than 3tn - are in a three-horse race to be the world's most valuable company.

Microsoft knows you don't run Windows on all of your gadgets, and it no longer cares. That, above all else, was the message the company conveyed for three whole days at its Build developer conference. Redmond is no longer trying to foist phones on consumers who don't want them. It stopped plugging its ears and pretending Google Docs and Chromebooks aren't a threat. And it won't beg people to throw out all of their devices and buy a dozen new ones so they can live their Best Windows Life.