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Windows 10 Cumulative Updates KB3156421 And KB3156387 build 10586.318

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Microsoft rolled out new Cumulative Updates KB3156421 And KB3156387 for Windows 10 PCs. This is the new May cumulative update for the current Windows 10 Version 1511. This update contains quality improvements and security fixes. There aren’t any noticeable differences that you’ll see in the UI or new features. However, it does fix bugs and improves security settings under the hood. This is update comes after April’s update KB3147458.218 which also had bug fixes and security updates.

The KB3156421 update is aimed at 10586 systems, Which includes quality improvements and security fixes. Hence enhancing the overall reliability of several features, including Cortana, Bluetooth, USB connections, Internet Explorer 11 Microsoft Edge.

It also addresses several known bugs like memory leak associated with pdf forms. Along with patched kernel mode drivers, and several other Windows components and apps, such as IE11, Microsoft Edge browser, Windows Shell, and Windows Journal.

The KB3156387 update targets 10240 devices and brings plenty of fixes. Including for the aforementioned memory leak experienced when working with PDF documents.

Whats New on Cumulative Updates KB3156421

This update includes quality improvements and security fixes. No new operating system features are being introduced in this update. Key changes include:

Improved reliability in a number of areas including Cortana, Bluetooth, Shell, Internet Explorer 11, Microsoft Edge, Miracast, and USB.

Windows 10 Build 10586 Fixed memory leak that occurs when opening a portable document format (PDF) form multiple times.

Fixed issues with text alignment for right to left languages in Internet Explorer 11 and Microsoft Edge.

Also Fixed issue that affected Bluetooth function when a PC resumes from sleep.

Fixed issue with revised daylight saving time.

Microsoft Fixed issue that sometimes corrupts Compact Flash cards inserted into a card reader.

Fixed issue that caused recorded video to be lost when answering an incoming call on some phones.

This Update Fixed additional security issues with kernel mode drivers, remote procedure calls, the Microsoft
Graphics Component, Internet Explorer 11, Microsoft Edge, Windows Shell, Windows Journal, Virtual Secure Mode, Schannel, and Jscript.

Check your Windows updates for  KB3156421 and KB3157993.

Users will see two updates named as Cumulative Update for Windows 10 Version 1511 for x64-based Systems (KB3156421) and Security Update for Adobe Flash Player for Windows 10 Version 1511 for x64-based Systems (KB3157993).

Restart your system after installing updates. New Windows 10 version will be 10.0.10586.318. You can check it by pressing WinLogo key+R then type Winver.


Windows 10 Mobile Build 10586.318 Fix includes:

Reliability, performance and stability improvements.

Fix for a problem that could result in unexpected battery drain while the phone screen is off.

Improvements to the update system to prevent phones getting into a state where attempting to take an update may lead to errors 0x800f081f or 0x80070570.

Fix for a problem that caused some phones to finish the initial setup wizard with an incomplete set of app tiles on the Start screen.

Improvements to the reliability of USB-C connections.


Improvements to Cortana, including a fix for a problem where music playback would not resume after dismissing an incoming text. And a problem with Quiet Hours not setting automatic rules for every day.

Fix for a problem that could result in the phone to hang or restart when visiting certain web pages in Microsoft Edge.

This Build Fix for a problem that caused recorded video to be lost when answering an incoming call on some phones.

Improvements for a reliability of internet connection sharing (ICS) and tethering.
Fix for a problem that caused the navigation bar to overlay and hide part of the screen for some apps on certain phones.

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