Years later they probably should have, Amazon’s modern lineup of Kindles will finally support the ePub file format for books. as per the changes observed by good e-readerAmazon updated its “Send to Kindle” document, saying it would add support for ePub files later this year. At the same time, though, Amazon is also disabling support for the MOBI file format, as it won’t support the latest Kindle features that the company wants to integrate.
At the moment, it’s unclear how ePub files will work on Kindle. Will independent sellers and publishers be able to submit their own ePub files for distribution? If so, would they need to use proprietary Amazon encryption? From the Send to Kindle documentation, there should be no DRM for the transferred ePub files to your Kindle or they will not work.
This is a huge boon to the Kindle ecosystem, as ePub files are the most widely used eBook format. Kindle owners had to use tools like Caliber to convert their files so they could read their books on their devices.
It’s little surprise as far as the loss of the MOBI file format is concerned. Amazon acquired Mobipocket, the inventor of the MOBI file format, in 2005. Amazon then rebranded MOBI to AZW, and it’s usable across devices. If you have e-books in the AZW/MOBI file format, they will still be safely stored and readable on your Kindle – you won’t be able to copy any new ones in that format in the future.
Source: Good E-Reader