Following Windows 10 Mobile build 14393.221, released to the (ahem) Release Preview (RP) Insiders ring a couple of weeks ago, we now have a 'Patch Tuesday' round-up release, updating production status (plus RP and slow ring) devices to 14393.321. See the official changelog below. Interestingly, Insider (RP) devices aren't showing the update, even though their OS build is older - note that I'm expecting the 'slow' Insiders ring to jump to the Redstone 2 branch imminently, as per my analysis the other day, so this may be the last non-Redstone 2 'slow' release.

From the Microsoft changelog page:

• Improved reliability of Bluetooth and storage file system.
• Addressed issue causing printer drivers to not install correctly after installing security update KB317005.
• Addressed issue causing sign-in errors if a password is entered incorrectly or a new password doesn’t meet password complexity requirements after installing security update KB3167679.
• Addressed issue that required users to log out and log back in before using the application they installed using the Windows installer (MSI).
• Improved support for networks by adding new entries to the Access Point Name (APN) database.
• Addressed issue that was causing excessive battery drain on Windows 10 Mobile when connected to Wi-Fi.
• Addressed issue in which setting up both fingerprint and iris recognition sometimes causes the sign-in to fail on Windows 10 Mobile.
• Addressed issue that was causing high CPU usage on Windows 10 Mobile.
• Addressed additional issues with multimedia playback, revised daylight saving time, authentication, Internet Explorer 11, and Windows Shell.
• Security updates to Microsoft Edge, Internet Explorer 11, Windows registry, and diagnostics hub.

So several major mobile-related fixes then and well worth having for all general users on non-Insider devices. Watch this space for more news of the various Insiders rings over the next few weeks.

Anyone with a smartphone running 'production' Windows 10 Mobile 'Anniversary Update' will get this update over-the-air. Your phone will tell you within a few hours, or you can check manually in Settings/Updates & Security/Phone update.

PS. The Release Preview ring should be getting this update, but not as I write this. It's either a temporary glitch or there's a separate RP ring build imminent with an even higher build number. This build has now rolled out to both Release Preview and Slow rings.