Amazon's Kindle readers support a variety of e-book formats, including MOBI, AZW, KF8/AZW3 and PRC. MOBI came from Mobipocket, which Amazon acquired in 2005, and files may use the MOBI or PRC ...
Kindle devices appeal to many people. When everything works, they're great. But Amazon is becoming more and more finicky, both in terms of supported formats and the freedom to manage your own books.