Microsoft accidentally revealed the pricing scheme for its next generation operating system, Windows Vista (due early 2007) when it mistakenly posted the details on their Canadian website.
The information, which has since been removed, revealed that the price of Windows Vista will range upto 499 Canadian dollars.
Windows Vista Ultimate will cost 499 Canadian dollars (about £240)
Home Premium will be charge at 299 Canadian dollars.
Upgrades are will be charged at half the full prices.
Microsoft said it will reveal US prices at the end of September.