Note that the Kindle devices themselves still do not support ePub files. (EDIT: as of the last time I checked a month or two ago, but maybe this has changed?)
Previously, you could send a MOBI file to your Kindle email address, and it would be delivered to your Kindle. Now, you have to send them an ePub file, and Amazon will convert it to an AZW3 file (which is structurally very similar to MOBI) and send that to your Kindle.
If you have an ePub file and you want to read it on your Kindle without going through Amazon's servers, you have to convert it to AZW3 (or MOBI) yourself, either using Amazon's Kindle Previewer GUI software (only available for Windows/Mac) or by using a third-party tool like Calibre.
Hasn't changed. Amazon has demonstrated some intent to do this in the future though, by deprecating MOBI and enabling the EPUB-over-email thing. The Pearson post mentions:
> Amazon has announced the retirement of its proprietary MOBI file format for eBooks, and a transition to the EPUB format for use on Kindle devices and apps.
which makes me wonder if they know more than we do?
Does this mean that the formatting due to conversation might change? Aren't the features of azw3 lacking compared to mobi: can this also result in unwanted changes?
Previously, you could send a MOBI file to your Kindle email address, and it would be delivered to your Kindle. Now, you have to send them an ePub file, and Amazon will convert it to an AZW3 file (which is structurally very similar to MOBI) and send that to your Kindle.
If you have an ePub file and you want to read it on your Kindle without going through Amazon's servers, you have to convert it to AZW3 (or MOBI) yourself, either using Amazon's Kindle Previewer GUI software (only available for Windows/Mac) or by using a third-party tool like Calibre.