December 12, 2017—KB4053580 (OS Build 15063.786)

Applies to: Windows 10, version 1703

Improvements and fixes


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

  • Updates Internet Explorer’s default visibility for the button that launches Microsoft Edge.
  • Addresses issue where users of SQL Server Reporting Services may not be able to use the scrollbar in a drop-down list.
  • Addresses issue that caused Windows Pro devices on the Current Branch for Business (CBB) to upgrade unexpectedly.
  • Addresses issue where applications may stop responding for customers who have internet or web proxies enabled using PAC script configurations. This is a result of a reentrancy deadlock in WinHTTP.dll. This can result in the following:

    • Microsoft Outlook can't connect to Microsoft Office365.

    • Internet Explorer and Microsoft Edge can't render any content (including local computer content, local network content, or web content).

    • Cisco Jabber stops responding, which blocks messaging and telephony features.

    • Any application or service that relies on WinHTTP is affected.

  • Addresses additional issues with updated time zone information.
  • Security updates to the Microsoft Scripting Engine, Microsoft Edge, and Windows Server.

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

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

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 4053580.