Vista Home upgrades to require an XP installation

When Windows Vista is released to consumers tomorrow, many users will be tempted to purchase an "upgrade" version of the operating system. The upgrade versions are 33-50% cheaper than the full retail ones, which might seem like a good deal. However, according to a knowledge base entry on Microsoft's website, users buying upgrade copies of the Home Basic and Home Premium editions of Vista won't be able to do a "clean" installation of the new operating system. Instead, the user will be required to have a previous version of Windows installed on his PC first. By contrast, upgrade versions of Windows XP simply required the user to verify that he owned a previous version of Windows by inserting the CD during the installation process. (Thanks to DailyTech for the tip.)
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