Whatever else you can say about multimillionaire technology entrepreneur Michael Robertson—the founder of MP3.com; Linspire, a Linux distributor; and SIPhone, a VOIP company, to name but a few—he has chutzpah. In each of his business ventures, he’s taken on giants, such as the music industry, Microsoft and Vonage. Now, with AjaxWindows, he’s at it again, with Microsoft once more in his sights.

AjaxWindows, according to Robertson, is a “complete virtual PC you can experience using only a browser from any Web-connected computer.” Linux, Windows, Mac OS—AjaxWindows doesn’t care what your actual desktop runs, so long as you’re running a modern browser—Firefox 2.0x for choice—Robertson claims you’ll be able to use it.