During calendar year 2007, Windows Vista Home products are projected to account for 90% of new Windows client operating environments deployed by home users. By comparison, Windows Vista Business and Windows Vista Enterprise will account for 35% of the new Windows client operating environments deployed by business users. During the second full year of availability, Windows Vista Business and Windows Vista Enterprise will grow to account for 80% of new deployments.

"After a long wait, the adoption of Windows Vista will take place almost immediately among consumers, while businesses will follow a decidedly more conservative adoption curve," says Al Gillen, research vice president, System Software at IDC. "Across the product mix, IDC expects to see a healthy movement toward Windows Vista Home Premium, while Windows Vista Ultimate will remain a niche product for some time to come."

During 2007, IDC expects that Windows Vista Home Basic will account for 67% of consumer purchases, with Windows Home Premium capturing 30% of the consumer acquisitions. Windows Vista Ultimate will account for 2% of the worldwide shipments. The balance of Windows Vista consumer shipments are home deployments of Windows Vista Business.

On the business front, 82% of Windows Vista deployments are expected to be the Business edition, while the remaining 18% will be Windows Vista Enterprise.

Through 2010, IDC forecasts Windows client operating environments to experience a 2005-2010 CAGR of 8.2%, leading to a total in excess of 200,000 annual shipments of Windows COEs in 2010.