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Mobi is a file format developed by French company MobiPocket. Questions about mobi can be about the file format and its features, as well as about availability.

MobiPocket originally developed the format for ebook readers on PDA devices (.prc). After the acquisition of the company by in 2005 mobi became the basis for the ebooks for Amazon's .

Mobi files are a binary packaging of and content files. Mobi supports .