Originally Posted by Blossom
When you sideload other then via USB, Mobi books wont appear unless you restart the Kindle or use File Expert to open them.
Oh, you're talking about sending via wifi or something? Or downloading a mobi directly via the browser?
It works fine via USB so I think it's clear that Amazon didn't have an nefarious intent, but I agree it should appear automatically in books regardless of how you get it in to the folder.