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Upgrade to another edition of Windows Vista: http://windowshelp.microsoft.com/Windows/en-US/Help/3af7e05f-4d2a-4af7-a168-9242f9093bb81033.mspx
Windows Anytime Upgrade: frequently asked questions: http://windowshelp.microsoft.com/Windows/en-US/Help/37070041-1b90-4433-be0c-ab2855841b981033.mspx