May 26, 2017—KB4023680 (OS Build 14393.1230)

Applies to: Windows 10, version 1607

Improvements and fixes


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

  • Addressed issue where End User Defined Characters (EUDC) may not be visible in some applications.

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


This update introduced an issue in which, if an iSCSI target becomes unavailable, attempts to reconnect will cause a leak. Initiating a new connection to an available target will work as expected. Microsoft is researching this problem and will post more information in this article when the information becomes available. For more information about this issue, see the following section.

How to get this update


To get the stand-alone package for this update, go to the Microsoft Update Catalog website.