In the past, the best option to access annotations and highlights was to transfer a locally stored ‘my clippings’ file after connecting a Kindle to a PC. To further organise the output of the file, according to e-book and location in an e-book, there were options to upload the 'my clippings' file to clippings.io or to utilise a Calibre plug-in. Thankfully things have moved on since then and Amazon released an update that allows greater flexibility and options to externally store a user’s notebook. On a Kindle device, the exporting a notebook to an external email is possible through first selecting reading settings and after that notes - from notes, there is an option to then email the notebook. Unfortunately, the ability to email notes and highlights applies to Amazon books and not personal e-books.
However, it is still possible to email and share a personal e-book's notebook to external accounts - e.g., Evernote and Onenote - via the Kindle application or Fire tablet. This is possible, as notes and highlights of e-books are stored in the Amazon cloud and automatically synced over different devices. Thus, a personal e-book's notebook would be available to export in the Kindle application when synced from, for example, a Kindle Paperwhite. The process of exporting the document is very easy and applies to both Fire tablets (Fire OS) and Kindle application - first tap on reading settings and then choose to export a notebook; after choosing to export, it is then possible to send the notebook to external applications. A further useful feature is the ability to export utilising different citation styles (APA, Chicago Style, MLA or none).