Plenty of free e-books in Mobipocket format show up fine on Kindle.
The Kindle has many flaws, but it does allow you to read a few different non-DRM formats.
The Kindle supports Mobipocket files directly. You don't need to write a script to do that.
We've known for some time already that Amazon's AZW files are actually Mobi files, but Amazon didn't share Kindle's Mobi PID which would allow one to buy encrypted Mobi books for Kindle.
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