A new build for Windows 10 Mobile Insiders, Build 14977, has been released. Like the desktop release last week, you can now read EPUB books on your phone, which is a nice addition.

Read EPUB books in Microsoft Edge on your phone: In addition to being able to read any unprotected e-book in the EPUB file format on your PC with Microsoft Edge – you can also read unprotected e-book in the EPUB file format with Microsoft Edge on your phone! When you open an unprotected e-book in Microsoft Edge, you will be taken into a customizable reading experience where you can change the font and text size and choose between 3 themes: light, sepia, and dark. As you read, you can leave bookmarks. To navigate through an e-book, you can use the table of contents or seek bar at the bottom of the browser. And you can also search for words or phrases and use Cortana to define specific words.