February 9, 2016 — KB3135173 (brings system to 10586.104)

This update includes quality improvements and security fixes. No new operating system features are being introduced this month. Key changes in this update include:
Fixed issues with authentication, update installation, and operating system installation.
Fixed issue with Microsoft Edge browser caching visited URLs while using InPrivate browsing.
Fixed issue that didn't allow simultaneous install of apps from the Windows Store and updates from Windows Update.
Fixed issue that delayed the availability of songs added to the Groove Music app in Windows 10 Mobile.
Improved security in the Windows kernel. Fixed security issues that could allow remote code execution when malware is run on a target system.
Fixed security issues in Microsoft Edge and Internet Explorer 11 that could allow code from a malicious website to be installed and run on a device.
Fixed additional issues with the Windows UX, Windows 10 Mobile, Internet Explorer 11, Microsoft Edge, and taskbar.
Fixed additional security issues with .NET Framework, Windows Journal, Active Directory Federation Services, NPS Radius Server, kernel-mode drivers, and WebDAV.

For more info about the security fixes in this update and a complete list of affected files, see KB3135173.