The MOBI eBook file format
The MOBI file extension was created in 2000 by Mobipocket. They produced Mobipocket Reader software for e-book readers (Windows Mobile, Palm OS, Kindle, Blackberry, etc), PDA’s, computers, and smartphones. The software is free. Amazon bought Mobipocket in 2005. Due to the end of support of MOBI files, no other current eBook reader is able to read the files. They were discontinued in 2007 when the AZW file extension replaced it. The conversion of the file type proves to be very useful to users with newer devices, especially Android devices.
Technical details of MOBI files