Some PC vendors and sellers will begin a coupon program on June 26 to entitle people who buy premium versions of Microsoft Windows Vista to upgrade to the new Windows 7 operating system when it arrives later this year, but the upgrade offers may not be free. Offers will vary by vendor and retailer.

Three Taiwanese PC makers plan to provide a coupon for a free Windows 7 upgrade to anyone who buys a new desktop or laptop PC loaded with Vista Home Premium, Vista Ultimate or Vista Business between June 26 and the time Windows 7 launches globally on Oct. 22, according to executives from the companies.

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