January 15, 2019—KB4480959 (OS Build 15063.1596)

Windows 10, version 1703, reached end of service on October 8, 2018 . Devices running Windows 10 Home, Pro, Pro for Workstation, and IoT Core editions will no longer receive monthly security and quality updates that contain protection from the latest security threats. To continue receiving security and quality updates, Microsoft recommends updating to the latest version of Windows 10.

IMPORTANT: Windows 10 Enterprise and Windows 10 Education editions will receive one year of additional servicing at no cost.

Improvements and fixes

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

Addresses an issue that causes downloads to fail because Mark of the Web (MOTW) was not supported at the download location.
Addresses an issue in Microsoft Edge that fails to trigger the focusin event if the focus event listener of an element shifts focus to another element.
Addresses an issue that may prevent some applications from displaying the Help (F1) window correctly.
Addresses an issue that causes BitLocker Network Unlock to fail on generation 2 virtual machines when it’s used in a network that only supports IPv4.
Addresses an issue that causes catalog signed scripts, including those shipped as part of Windows, to incorrectly generate a Windows Defender Application Control (WDAC) failure audit event.
Addresses an issue that may cause a 30-second delay when deleting or renaming a link in a Distributed File System (DFS) Namespace. Additionally, renaming a folder may take 30 seconds when multiple users work in a group share simultaneously, and File Explorer stops responding.
Addresses an issue that prevents you from overwriting a file in a shared folder because of an Access Denied error when a filter driver is loaded.
Addresses an issue that may cause third-party applications to have difficulty authenticating hotspots.
Addresses an issue that throws an exception when instantiating SqlConnection after you install the August Preview of Quality Rollup or September 11, 2018 .NET Framework update.
Addresses an issue that fails to recognize the first character as the abbreviation for the Japanese Era name. For more information, see KB4469068.

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

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 doesn't apply to long-term servicing editions.

Known issues in this update

Symptom	Workaround
Applications that use a Microsoft Jet database with the Microsoft Access 97 file format may fail to open if the database has column names greater than 32 characters. The database will fail to open with the error, “Unrecognized Database Format”.	This issue is resolved in KB4487020.
After installing KB4480973, some Microsoft Edge users report that they: Cannot load webpages using a local IP address. Cannot load webpages on the Internet using a VPN connection. Browsing fails or the webpage may become unresponsive.	This issue is resolved in KB4487020.
After installing this update, the first character of the Japanese era name is not recognized as an abbreviation and may cause date parsing issues.	This issue is resolved in KB4487011.
After installing this update, MSXML6 causes applications to stop responding if an exception was thrown during node operations, such as appendChild(), insertBefore(), and moveNode(). The Group Policy editor may stop responding when editing a Group Policy Object (GPO) that contains Group Policy Preferences (GPP) for Internet Explorer 10 settings.	This issue is resolved in KB4493474.
Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.	Do one of the following: Perform the operation from a process that has administrator privilege. Perform the operation from a node that doesn’t have CSV ownership. Microsoft is working on a resolution and will provide an update in an upcoming release.

How to get this update

Before installing this update

Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security fixes. For more information, see Servicing stack updates.

If you are using Windows Update, the latest SSU (KB4486458) will be offered to you automatically. To get the stand-alone package for the latest SSU, go to the Microsoft Update Catalog.

Install this update

To download and install this update, go to Settings > Update & Security > Windows Update and select Check for updates.

To get the stand-alone 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 4480959.

January 15, 2019—KB4480959 (OS Build 15063.1596)

Improvements and fixes

Known issues in this update

How to get this update

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