The story
Amazon.com bought Mobipocket.com in 2005.
An alpha release of the Java-based version of the Mobipocket reader became available for cellphones on June 30, 2008. There is also a reader for desktop computers running Microsoft Windows, which also works with computers running Mac OS X or Linux using Wine.
Since Amazon's acquisition of Mobipocket, software support, user support, and platform growth ended. In December 2011, Amazon reportedly officially notified book publishers that it was ending support for Mobipocket. The status of Mobipocket digital rights management (DRM) content previously purchased by users was unclear since no other eBook-reader supported its proprietary DRM method.
On October 31, 2016, Amazon permanently shut down the Mobipocket website and servers.
From Wikipedia’s article on Mobipocket, shared under CC BY-SA 4.0.3