Nathan Myhrvold answer is extremely impressive. There is a lot of extremely accurate forecasting in this email from the cheapening of the value of the OS to his

Nathan Myhrvold answer is extremely impressive. There is a lot of extremely accurate forecasting in this email from the cheapening of the value of the OS to his extremely interesting idea about storing files on the internet with the File API which is more or less Dropbox before Dropbox. Reading that you realise how wrong a choice it was to put Ballmer in charge and how much it cost Microsoft.