On web pages taking pre-orders for consumer versions of Vista, Amazon.com lists 30 January 2007 as the date the OS will be shipping.

According to Amazon.com, Windows Vista Business will cost $299, while an upgrade will sell for $199.Windows Vista Home Basic will cost US$199 for a new copy and $99.95 for an upgrade. Windows Vista Home Premium, a step above Home Basic in functionality, will sell for $239 for a new version and $159 for an upgrade. And Windows Vista Ultimate, the highest-end version of Vista for consumers, will cost $399 for a new copy and $259 for an upgrade, according to Amazon.com.

Microsoft has said it will make consumer versions of Vista available in January, but it has not given a specific date or announced prices for the various versions of the OS. On Tuesday, in a statement sent by email sent through its public relations firm, the company still would not confirm exact availability or pricing for Vista.

Microsoft on Monday accidentally listed the pricing of the high-end consumer versions of Windows Vista on its Canadian Web site.

In a statement through its public relations firm, Microsoft acknowledged Monday that it "inadvertently" posted Windows Vista Canadian retail prices on its website, but then removed the information. The company plans to reveal the official U.S. pricing for Vista when it makes available the first release candidate of Vista sometime before the end of September, it said.

Windows Vista Ultimate is a new edition of Windows that includes all of the multimedia capabilities currently available in Windows XP Media Center Edition, as well as a new 3D graphical user interface called Aero and security features.