March 13, 2018—KB4088786 (OS Build 10240.17797)

Improvements and fixes

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

• Addresses issue with printing XML documents with Internet Explorer and Microsoft Edge.
• Addresses issue with Internet Explorer and Microsoft Outlook integration.
• Addresses issue where Internet Explorer stops working when using F12-based developer tools.
• Updates legacy Document Mode cell visibility in Internet Explorer.
• Addresses issue where Internet Explorer is unresponsive in certain scenarios when a Browser Helper Object is installed.
• Addresses issue where files protected with the Encrypting File System (EFS) may become corrupted during BitLocker decryption or drive encryption.
• Addresses issue where IoT devices may stop working because of an “unmountable_boot_volume” error when UWF is enabled.
• Due to recent work with our antivirus (AV) partners, AV software has now reached a sustained level of broad compatibility with Windows updates. After analyzing the available data, we’re lifting the AV compatibility check for the March 2018 Windows security updates for supported Windows 10 devices through Windows Update. We’ll continue to require that AV software be compatible. Devices with known AV driver compatibility problems will be blocked from updates. We recommend that customers check installed AV software compatibility with their AV provider.
• Security updates to Internet Explorer, Microsoft Edge, Microsoft Scripting Engine, Microsoft Graphics component, Windows Kernel, Windows Shell, Windows MSXML, Windows Installer, Device Guard, 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 ImprovementsMicrosoft 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 informationFor a list of the files that are provided in this update, download the file information for cumulative update 4088786.