Today Microsoft made Windows 10 Mobile build 10586.164 available to Windows Insiders in the slow and release preview rings.

They are also releasing PC build 10586.164 to Windows 10 users not on the Redstone preview, this is a public build not a Windows Insider build. This update is being released as cumulative update KB3140768 and it’s available from Windows Update.

Microsoft noted the following on Windows’ update history site:

Improved support for Bluetooth, wearables, and apps accessing contacts.

  • Improved reliability in app installation and Narrator.

  • Improved performance for hibernation, content entry in apps, and downloading and installing updates.

  • Fixed issue that didn’t allow login to an Xbox from a PC running Windows 10.

  • Fixed security issue created when attempting to play corrupted content.

  • Fixed security issue that could allow remote code execution while viewing a PDF in Microsoft Edge.

  • Fixed additional issues with .NET Framework, Internet Explorer 11, and networking.

  • Fixed additional security issues with Microsoft Edge, Internet Explorer 11, USB storage driver, kernel mode drivers, .NET Framework, graphic fonts, OLE, secondary logon, PDF library, and Adobe Flash Player.