March 13, 2018 - KB4088779 (OS Build 10586.1478)

Applies to: Windows 10 Version 1511

This update can only be applied to Windows 10 Enterprise and Windows 10 Education editions.
Reminder: The additional servicing offer for Windows 10, version 1511 ends on April 10, 2018 and doesn't extend beyond this date. To continue receiving security and quality updates, Microsoft recommends updating to the latest version of Windows 10.

Improvements and fixes

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

  • Addresses issue where Internet Explorer stops working when using F12-based developer tools.
  • Lifts the Anti-Virus (AV) compatibility check to expand the number of Windows 10 devices that are offered cumulative Windows security updates. This includes cumulative Spectre and Meltdown protections for 32-Bit (x86) and 64-Bit (x64) versions of Windows, except the KB4078130 update that was offered to disable mitigation against Spectre Variant 2.
  • Addresses issue that only affects some versions of antivirus software and only applies to computers on which the antivirus ISV updated the ALLOW REGKEY.
  • Security updates to Internet Explorer, Microsoft Edge, Microsoft Scripting Engine, Microsoft Graphics component, Windows Kernel, Windows Shell, Windows MSXML, Device Guard, Windows Installer, and Windows Hyper-V.

If you installed earlier updates, only the new fixes in this package will be downloaded and installed on your device.

For more information about the resolved security vulnerabilities, see the Security Update Guide.

Windows Update Improvements
Microsoft has released an update directly to the Windows Update client to improve reliability. Any device running Windows 10 configured to receive updates automatically from Windows Update, including Enterprise and Pro editions, will be offered the latest Windows 10 Feature Update based on device compatibility and Windows Update for Business deferral policy. This does not apply to long-term servicing editions.

Known issues in this update

Microsoft is not currently aware of any issues with this update.

How to get this update

This update will be downloaded and installed automatically from Windows Update. To get the standalone package for this update, go to the Microsoft Update Catalog website.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4088779.


Direct download links for KB4088779 from Microsoft Update Catalog:

Download KB4088779 MSU for Windows 10 Version 1511 32-bit (x86) - 537.5 MB

Download KB4088779 MSU for Windows 10 Version 1511 64-bit (x64) - 919.6 MB