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.
Another executive said the upgrade coupons will be good from June 26 through Jan. 31, 2010 and are meant to encourage people to buy new PCs ahead of.....