According to this article Microsoft have just passed the 88 million mark with Vista: http://computerworld.co.nz/news.nsf/news/121980AEC5F7B167CC257382006D7E9A And Apple just announced that it sold 2 million copies in the first weekend of sales. Vista is selling at the average rate of a quarter of a million copies a day. Although it is too early to judge the kind of averages OS X can hope to achieve, it will be fun to see the announcements coming out of each camp with updates on their numbers. Go on Steve J. and Steve B. lets have live sales tickers then someone can chart the two against each other. A real twenty-first century deathmatch would occur then.