PetManimal writes: "A loophole in Vista's activation scheme that lets users install an upgrade version of Vista on Linux machines and save up to $140 is spreading over the Internet and causing Microsoft a fair amount of embarrassment. The trick involves installing Vista twice but not entering the product key the first time, which effectively fools Vista into upgrading itself. While most home users are unlikely to try this, it may appeal to some PC DIYers and other power users:
According to the last article, Microsoft is aware of the scheme and says it violates the Vista EULA."The type of person most likely to benefit from this workaround are power users and hobbyists who own multiple computers running Windows as well as Linux and Mac OS X. Indeed, one concrete scenario would be someone with a used PC that's just one or two years old running either Linux or OS X who decides to convert it to Vista and buys the upgrade version of the OS to do so.