PC World published details about Microsoft's Windows 7 upgrade program, you can read it over here.
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. They requested not to be named in this story for fear of harming their business relationship with Microsoft, because the software giant has not yet announced the timing of its Windows Upgrade Option (WUO) program.