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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