Here's what got fixed in Windows 10 build 10586.456

Yesterday, Microsoft released Windows 10 build 10586.456 for both PC and Mobile to the Release Preview ring. As usual with a cumulative update on the Insider Preview, release notes were nowhere to be found.

In fact, sometimes Microsoft will publish them in the Answers forum, in the Feedback Hub, and rarely, on the Windows Blog. PC updates can be found on the Windows 10 Update History page, but only when they're released to Production. As for the Windows 10 Mobile Update History page, let's just say that it was used so little that it no longer exists.

Today's release notes can be found in the Feedback Hub. Here's what got fixed in yesterday's update:

• Improved reliability in a number of areas including Windows Media player, Internet Explorer 11, Windows Explorer, Miracast, and Windows kernel.
• Fixed an issue with some users noticing a black screen instead of the lock screen, when resuming from connected standby.
• Fixed issue where the DirectAccess Disconnect button appears sometimes even when the connection is not fully established.
• Fixed issue where local user accounts weren’t locked out after a number of failed sign in attempts.
• Improved support for playback of video in certain applications that did not render the video while the audio continued after resuming from sleep.
• Fixed issue where the Windows Phone sometimes loses user authentication certificates after upgrading to Windows 10 Mobile.
• Improved support to honor the data backup settings of applications on Windows 10 Mobile.
• Fixed issue where Microsoft Silverlight based application won't install on Windows 10 Mobile, after joining Azure Active Directory.
• Fixed additional issues in .NET, Windows Kernel, Windows Update, Authentication, revised daylight saving time, support for PDF files, Bluetooth, Microsoft Edge, Internet Explorer, Networking and Wi-Fi connectivity.

The release notes seem to be mashed up between the PC and Mobile versions of the build; however, we should probably just feel lucky that we got release notes at all.

The PC update is KB3170411, and it will come in at 505MB on an x86 machine and 931MB on x64.