IDG has news, but no pricing details, about how PC makers will market Windows 7 to new PC buyers long before it's released to the public.

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.

PC vendors will have to pay between US$9 and US$15 per PC to include an upgrade coupon with a new computer, said an executive at one Taiwanese PC maker. People will use information on the coupon to download a copy of Windows 7 from a Microsoft Web site once the software is on sale, he said, and Microsoft will also send the holder a copy of the operating system on a disc.

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 the Oct. 22 launch date for Windows 7.