WSJ.com: Microsoft Will Let CEOs Test Its Tablets at Annual Summit "The celebrity test run is just one more milestone in a long and expensive journey to market. Microsoft first showed off a prototype of the Tablet nearly two years ago, touting the potential to revolutionize computing by allowing people to take handwritten notes on a full-fledged computer in a business meeting, in a class or on a sales call. Since the notes would be stored on a computer, instead of on a tablet of paper, people could then convert them into type and file them away -- or search through them in their original, handwritten form, even inserting new comments or sending snippets of them in e-mails."