Windows7 unit sales in the US were 234% higher than Vistas

According to leading market research company, The NPD Group Windows 7 software unit sales in the U.S. were 234 percent higher than Vistas first few days of sales. Revenue growth was not as strong though. A combination of early discounts on pre-sales and a lack of promotional activity for the Ultimate version resulted in dollar sales that were 82 percent higher than Vista.