The Windows 7 Upgrade Option is available through participating PC manufacturers on selected PCs and through Microsoft on qualifying purchases of the Windows Vista packaged product. The Windows 7 Upgrade Option applies to Windows Vista Home Premium, Business, and Ultimate editions. Your Windows 7 upgrade will be to the comparable version: so you'll get either Windows 7 Home Premium, Windows 7 Professional (the upgrade to Windows Vista Business), or Windows 7 Ultimate, respectively. The Windows 7 Upgrade Option program runs from June 26, 2009 through January 31, 2010. Individual manufacturers may choose to offer the option for a shorter period on their PCs. Offer details, prices, and upgrade delivery methods will vary. For details for new PC purchases, please check the manufacturer's web site. For purchases of retail packaged software, please go to the Windows 7 Upgrade Option fulfillment site for retail packaged software.