Well I got a lot of free pd books on my pc that my friend with a kindle wants ,she say I have to email to kindle and they'll send to her? I said she just come over and I can load the on to her kindle via usb cable in 1/10 the time and no charge to her(amazon charges for email to the kindle?) I know you can not put the books in folders for organization , but I cant believe that you can transfer public domain text, mobi formatted to the kindle and back form the kindle via usb. Sorry for the newbie question but I use a Libre pro and usb transfers are a non issue . Thanks for any helpful posts.