February 19, 2019—KB4487021 (OS Build 16299.1004)

Improvements and fixes

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

• Updates time zone information for Chile.

• Improves performance related to case-insensitive string comparison functions such as _stricmp() in the Universal C runtime.

• Addresses an issue with evaluating the compatibility status of the Windows ecosystem to help ensure application and device compatibility for all updates to Windows.

• Improves the reliability of the UE-VAppmonitor.

• Addresses an issue that fails to update a user hive when you publish an optional package in a Connection Group after the Connection Group was previously published.

• Adds a new group policy called “Policy Details”. This policy will immediately disconnect any wireless connections when a wired connection is detected and “Minimize simultaneous connections” is configured.

• Addresses an issue that causes the clock and the calendar flyout to ignore user settings for Japanese era date and time formats. For more information, see KB4469068.

• Addresses an issue that can overwrite gan-nen support behavior for the Japanese era with a newer update. For more information, see KB4469068.

• Enables the 元年 character for the first year in the Japanese era. For more information, see KB4469068.

• Addresses an issue that fails to display the correct Japanese era name in Microsoft Office Visual Basic for Applications. For more information, see KB4469068.

• Addresses an issue that fails to recognize the first character of the Japanese era name as an abbreviation and may cause date parsing issues.

• Addresses an issue that may prevent Internet Explorer from loading images that have a backslash (\) in their relative source path.

• Addresses an issue that may cause applications that use a Microsoft Jet database with the Microsoft Access 95 file format to randomly stop working.

• Addresses an issue that may cause logon delays of up to 10 minutes. This occurs when an API requests a Group Policy to be refreshed during Group Policy processing. Common scenarios that generate this issue are laptops resuming from a short Sleep or lid closure or when using third-party credential providers that set registry keys at logon.

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

Known issues in this update

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 (KB4485448) 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 4487021.