Amazon Kindle is dropping support of the .mobi format
The
Kindle reader is available for all operating platforms and it now
supports the .epub
format.
.epub
(electronic publication) is a widely used format and has been
proposed as an international standard. The very best reader is
Calibre. It can
read and convert all formats (including word, PDF and others). It is however
only available for Windows, Mac and Linux. For Android devices you may download
a reader like Moon+
(ad-free) that can read most of the currently available formats, including
.mobi.