Originally Posted by dirtyvectors
, and I guess amazon will convert down to send out to older kindle models.
Actually, I suspect that your book simply won't be available
to older Kindle devices/owners if you're only uploading the stand-alone AZW3 (KF8) format. I'm pretty sure they need the source and/or a combined MOBI/KF8 file to ensure delivery/functionality across the entire range of Kindle devices.