How can you convert an EPUB file to Kindle’s MOBI / AZW format? Actually you only need one file, the EPUB, and it will work for both.
Converting Word document using Amazon Kindle Direct Publishing (KDP)
Amazon’s Direct Publishing (KDP), formerly Digital Text Platform, is the easiest way to publish your e-book to the Amazon Kindle. For those still unfamiliar with e-readers, Amazon’s wireless reading device, the Kindle, allows you to download and read thousands of book titles instantly. Similarly, these same titles can also be downloaded for reading to your Mac, PC, or other device, such as the Android smartphone.
Packaging Your Word Novel to AZW Using Amazon’s DTP
When writing your novel for upload through Amazon’s DTP, you may have heard you need to use Word 2003 or earlier (.doc) and not Word 2007/2010 (.docx). This is only true if you plan to upload the document directly as a Word document through DTP.