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Microsoft’s employees took a few days off to spend Thanksgiving with their families, but now they’re back to work with force and a new major update for Windows 10. The Insider Preview build 14977 for Mobile is available for mobile, after on November 17 was released the build 14971 for PC.

So, Insiders in the Fast Ring have just received a new update for Windows 10 on their mobile devices, which comes with minor improvements and a new feature – support for EPUB books in Microsoft Edge.

This feature was firstly added to Windows 10 PC and users have discovered that they were able to view EPUB files right from Edge, so now it’s possible to do this on Windows 10 Mobile devices, as well. There are three different themes (light, sepia, and dark) for the EPUB reader and you can also change the font and text size, bookmark your location, search for e-books with Cortana etc.

This build brings another improvement, such as the ability for third-party Alarm apps to notify users about the alarms they’ve set during Quiet Hours. In addition, an option that was frequently enabling accidentally alarms on the lock screen has been removed from the Notification Settings.

However, Microsoft has enabled OAuth support for Yahoo Mail accounts and changed the rendering technology used for “many types of UWP app content”.

According to the change-log, there are many bugs that have been fixed, such as the issue that caused the audio to no longer work when disconnecting and reconnecting a wired headset; an issue that caused certain music apps to unexpectedly stop playing music after a single song; a glitch that made Edge to open a blank page with the address of a previously closed tab; an issue that caused the Start Settings page to not render when opened on external screen while using Continuum etc.

There are also some known issues in Windows 10 Build 14977 and users are warned to not install languages, keyboards, and speech packs on their phones, because the download may not finish.

Also, Bluetooth and USB/Autoplay don’t work, while when trying to install the update on devices with 8GB of internal storage, users will receive a 0x800700b7 error.