On the corporate side, momentum has been harder to come by. 'There was a very vocal minority of people that were kind of ripping into Vista.' 'It got off to kind of a rocky start,' he said. Vista has picked up momentum in recent months, said Samir Bhavnani, an analyst at Current Analysis West. 'We have a lot of consumer interest and enthusiasm around it,' CEO Steve Ballmer said in an interview with CNET last week. Still, the company has now managed to sell 88 million copies of the operating system, a significant tally. Granted, some of that bump came from a crackdown in piracy and because more people are opting for 'premium' versions of Vista. In last week's earnings announcement, Microsoft reported a 25 percent increase in revenue from the unit that sells Windows for notebook and desktop PCs. Windows Vista has certainly had its fair share of naysayers, but the operating system is clearly finding its way onto lots and lots of PCs.