If you've reached this step, you must be a seriously motivated writer, or a Friday-nights-are-for-jailbreaking-my-iphone computer geek because the truth is that you can certainly upload your MS Word. NOTE FOR MAC USERS: Go directly to our How to Create an EPUB file page and follow our intructions for downloading and using Calibre to convert your book into both ePUB and Kindle (MOBI) file formats. How to Convert Your Manuscript to a Kindle eBook (for PC Users)