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mobi IS historically the native Kindle format and is an Amazon proprietary format! The newer Kindle's now support some additional proprietary Amazon formats such as KF8 and AZW but mobi is still your most portable format across different models of Kindle.
The format most other reading devices use is epub. this is an open standard and not tied to any vendor. Unfortunately Kindle's cannot handle this format. If the files are nor DRM protected then Calibre can convert between these formats.
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