Microsoft is revising a program that allows Windows Vista customers to upgrade from a basic version of its OS to one of the premium editions.
The program, called Windows Anytime Upgrade, was designed to make it easier for customers to upgrade to a more expensive version of Vista by allowing them to purchase a digital "product key" and download it from the Web.
At the time that they purchased their OSes, customers received a DVD containing several versions of Windows Vista, including the premium editions. Downloading the new product key allowed them to unlock a higher-end version from the disc.
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