Want to get Windows 7 on the cheap? Well then, it looks like pre-ordering is the way to go. From Friday through July 11, consumers in the U.S. will be able to buy an upgrade copy of Windows 7 Home premium for $49 or Windows 7 Professional for $99. That offer is good for both XP and Windows Vista PCs, regardless of whether someone has been trying out the pre-release version of the operating system. That matches the details in a memo from Best Buy that leaked earlier this month.

When boxed copies of Windows 7 go on sale on October 22, Microsoft plans to charge $119 for Home Premium, $199 for Professional and $219 for Ultimate. The Home Premium upgrade is down $40 from the product's original price, although the Vista product had already gotten a price cut along the way. The Professional and Ultimate versions are priced similar to where Microsoft was with Vista. The upgrade prices apply to those moving from a previous version of Windows to Windows 7, but only those from Windows Vista will be able to upgrade without doing a clean installation of the product.

The full versions of Windows 7--the editions for those without a copy of Windows--will be priced at $199 for Home Premium, $299 for Professional and $319 for Ultimate. The Ultimate and Professional editions are again on par with their Vista counterparts, while Home Premium is down from the $239 that Microsoft had charged with Vista. Microsoft also plans to offer the operating system in an easier-to-open box.