Non DRM Mobipocket format is already supported on the Kindle - just drag and drop.
The Kindle has many flaws, but it does allow you to read a few different non-DRM formats.
Kindles can read a variety of non-proprietary, non-DRM'ed formats. They read TXT, HTML, JPEG, and non-DRM Mobi files directly.
DRM is not to prevent other files from being readable on the Kindle.
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