Microsoft chief Steve Ballmer used his Worldwide Partners Conference keynote on Monday to tout Windows 7's success while trying to downplay the success of the Mac. The most recent OS had now reached 400 million licenses sold, up from 350 million in the winter and still growing faster than XP. He added that there were 350 million new PCs sold in the past year and used the large number, without comparing gains, to argue that Microsoft had no reason to worry about the Mac or Linux.
