The adoption forecast is in line with recent studies conducted by CDW and Gartner.
Endpoint's forecast is based on hardware, so licenses shipped by OEMs. The forecast does not account for licenses enterprises might deploy through volume licensing. According to Microsoft financial statements, about 80 percent of revenue comes from OEM license sales.
The report doesn't assess which Windows Vista versions will be most popular. PC manufacturers and Microsoft expect that Windows Vista Home Premium will dominate the consumer market. Business market is more uncertain, with a possible split among Windows Vista Business, Ultimate and Enterprise. The latter two are essentially identical, except that Enterprise is strictly sold through volume licensing.