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Microsoft Releases New Insider Preview Build for Windows 10 PC & Mobile, Windows Server 2016

With Windows 10 Fall Creators Update inching to roll out to mainstream users, Microsoft’s latest Windows 10 build 16241 released to PCs in the Fast ring, adds a number of feature inprovements like Mixed Reality, Fluent Design.

Though, Microsoft had in May announced that the next Windows 10 update would be known as “Fall Creators Update,” however, it now looks that this will also be released as the “Autumn Creators Update” in some countries.

As spotted by Windows Central, Microsoft has quietly changed instances of “Fall Creators Update” to “Autumn Creators Update” on its dedicated page in the UK (photo below).

Also released, is a new Insider Preview Build 15230 for Mobile, along side latest SDK and ISOs for Windows 10 build 16232, and the first Insider Preview test build 16237 of Windows Server 2016.

Among the Mixed Reality fixes are support for Mixed Reality Motion Controllers over USB (with Wireless/Bluetooth support to come “soon!”), improved stability of the headset during your Mixed Reality session and more.

Build 16241, also adds Windows Shell improvements with ability to recover pins and password from the lock screen.

Microsoft also integrated Cloud Self Service Password Reset (Cloud SSPR), a popular Azure AD Premium (AADP) feature into this build.

In the main settings page, now titled “Delivery Optimization” indicates, that in addition to enabling or disabling P2P, “it’s also used when downloading updates and apps from Microsoft content servers.” Just go to Settings -> Update & security -> Windows Update under “Advanced options” and then “Delivery Optimization, to configure various Download and Upload settings.

windows 10 fall creators update delivery optimization advanced options

Accompanying the new test build, Microsoft also made available Canonical Ubuntu Linux dstro from the Windows Store, which can installed on any Insider Preview build >= 16215.

Microsoft is expected to begin rolling out the Windows 10 Fall Creators Update beginning around September of this year.

Along with, a new Windows 10 Preview Build of the SDK is released to be used in conjunction with Insider Preview build 16232 or greater.

The Preview SDK can be downloaded from the developer section on Windows Insider.

Microsoft also released an updated Windows 10 Mobile preview build (15230) today that includes a few fixes and no new features.

Lastly, the first Windows Server Insider Preview Build 16237 released to Windows Insiders. Those interested to access, should register at the Windows Insiders for Business program or the Windows Insider Program.

Any registered Insider can grab the build here. This build expires on December 4, but Microsoft has provided keys that can be used throughout the pre-release cycle:

Server Datacenter Core: B69WH-PRNHK-BXVK3-P9XF7-XD84W
Server Standard Core: V6N4W-86M3X-J77X3-JF6XW-D9PRV

See the full changelog under for all three releases:

Build 16241:

  • We fixed an issue preventing profile cards in the Xbox Live in-game experience from working.
  • We also fixed an issue causing Game bar to crash while broadcasting.
  • The GPU name is now shown on the left-hand side of the Performance tab for each GPU.
  • We now default to the multi-engine view, which shows performance monitors for the four most active GPU engines. Typically you’ll see charts for the 3D, Copy, Video Encode and Video Decode engines. Right-click on the chart to switch back to the single-engine view.
  • There is now a total GPU memory text counter next to the dedicated and shared text counters at the bottom of the Performance tab.
  • The Direct X version now also contains the highest supported DX feature level.
  • additional processes (such as the Chakra JIT Compiler, UI Service, and Manager process) are now labeled in Task Manager.
  • List of improvements and fixes for the Windows Mixed Reality experience in the new build:

    • Added support for Mixed Reality Motion Controllers over USB (Wireless/Bluetooth support to come soon!)
    • Connection reliability improvements (Code 43 errors in Device Manager).
    • We’ve updated the Mixed Reality Portal icon.
    • We’ve updated teleportation experience to make this more intuitive and direct.
    • We have also improved stability of the headset during your Mixed Reality session.
    • We have fixed the issue where the Hill on the side of the cliff house flickers.
    • We have also fixed where the audio of HoloTour can now turn off promptly when switching between apps and cliff house.
    • we have also fixed speech commands to work during exclusive app sessions.
    • We have also improved the experience where we can now load the Environment effectively with no black screen during startup.
    • Mixed Reality Portal now explicitly informs users that headsets require USB 3.0.
    • Improved support for ASMedia and other 3rd party USB controllers
    • 4K 360 Video streaming has also been improved in this build.
    • 3Glasses improvements: we have fixed various issues with 3Glasses headset and controller to help jumpstart your development.
    • Preset holograms in the Cliff House now show up in the right order.
    • We have also fixed the issue where black screen is shown when the environment is loading.
    • We have fixed the headset’s sleep cycle to correct according to user activities.
    • We have also fixed the issue to enable users to share the Mixed Reality captures to Facebook.
  • General changes, improvements, and fixes for PC
  • The Pin to Taskbar option is now grayed out for InPrivate sessions in Microsoft Edge. Websites pinned to the taskbar from an InPrivate session on a previous build will now open in a regular (non-InPrivate) Microsoft Edge session.
  • We fixed an issue where Windows Defender Security Center showing an ‘Unexpected’ state depending on the implementation of the 3rd party firewall product.
  • We fixed an issue where the battery status on certain laptops wasn’t updating while the device is unplugged. Thanks everyone who shared logs to help narrow this down.
  • We fixed an issue from the last flight where apps that called into the firewall, such as Microsoft Edge and other apps using networking, might become unresponsive until you rebooted.
  • We fixed an issue from the last flight resulting in the Surface Dial UI not appearing.
  • We fixed an issue when in Recovery Settings if you chose “Reset This PC” > “Keep My files” the operation would fail at 1% and will revert with no changes to the system.
  • We fixed an issue resulting in an increase in UWP app reliability issues, for example in Microsoft Edge and Photos, in recent flights.
  • If you were still seeing Storage Spaces issues in 16237, please try again in 16241 and let us know if the issues have been resolved. We’ve made an adjustment to our previous fix.
  • We fixed an issue resulting in Windows Media Player displaying a class registered error when attempting to play music files in recent flights.
  • We fixed an issue where the touch keyboard wasn’t automatically displaying upper case keys at the beginning of sentences.
  • We fixed an issue where Storage Settings might show the size of C: as double the actual size.
  • General changes, improvements, and fixes for Mobile
    • We fixed an issue where VPN profile appeared to be always ON.
    • We fixed a notification issue between the Bluetooth Support Service and device background services for fitness bands.
    • We fixed issues with Caller ID matching in Japan & Denmark.

    Known issues for PC

    • IMAP email accounts such as Gmail, Yahoo, and Aol may not sync in the Mail app in this build.
    • Trying to use the dictation hotkey (WIN + H) in UWP apps won’t work – you’ll see the UI come up and immediately dismiss. If you’d still like to use dictation, the microphone in the touch keyboard will work. You can right-click the Taskbar for an option to show the touch keyboard button if it’s not already visible.
    • We’re investigating your reports that the Copy Link option displayed in Microsoft Edge when you right-click a hyperlink isn’t working in recent builds.
    • There is an issue with PC Games using the Origin overlay. Use of overlay may cause game movement to lock up.
    • We’re investigating your reports that after upgrading to the latest Insider Preview builds, some network settings are lost and revert to default settings. Static IP address configuration is reverted to DHCP. Networks which were marked as private are reverted to public. After the upgrade you will need to manually readjust your network settings back to your preferred settings.
    • If you have display scaling higher than 100%, you may encounter a bug where the hit targeting is offset when interacting with various parts of the shell. This is particularly noticeable in Action Center, where it might appear that nothing in Action Center can be cleared, but can also happen with the taskbar Jump lists and My People. If this happens, go to Settings > System > Display and change the size of text, apps, and other items to something else. Once you’ve done that, put it back to how you like it and issue should be resolved.
    • Some apps like Tweetium may not render the UI correctly and be difficult to use.
    • Windows Defender Security Center cannot be used to configure and list items for Controlled folder access, Threat History and Exclusions due to a crash in the UI. This is not affecting the real-time protection capabilities and will be fixed in the next build.

    Windows Server 2016 Build 16237:

      Developers and Containers:

      • New base container images (available on Windows Insider Docker Hub repo)

        • Optimized Nano Server base image (over 70% smaller)

          • The .NET team is providing an preview image based on Nano Server with .NET Core 2.0

          • The PowerShell team is providing a preview image based on PowerShell 6.0

        • Optimized Server Core base image (over 20% smaller)

      • Support for SMB volume mounting

      • Infrastructure for Orchestrators

        • Networking enhancements for on going Kubernetes work

        • Named pipe mapping support

      • Bug fixes, performance enhancements

      Cloud Guest:

      • IIS

        • TLS info: administrators can make specific recommendations to default to HTTPS

      • Disaster Recovery

        • Storage Replica Test Failover

      • Guest + Host better together

        • vPMEM in Guest: Tenants can use and manage PMEM/SCM

        • Tenant-Aware VM Start Ordering: App Ready / OS Heartbeat for better load balancing

        • Guest RDMA

      • Improvement in time accuracy

      • Azure enlightened clusters – optimized to run on Azure IaaS

      Cloud Host:

      • Software Defined Data Center (SDDC) host
        • Security
          • Shielded Linux VM

          • SDN: Encrypted virtual networks

          • Secure clusters

          • SMB 1 disabled by default

        • Resiliency and Availability

          • SDN: Reduced downtime for tenant connections through gateways

          • Spaces Direct: Scoped Spaces to mitigate impact of multi-node loss

          • Spaces Direct: Marginal drive handling for predictive detection of drive failures

        • Efficiency

          • Data Deduplication available for ReFS

          • New Data Deduplication DataPort API for optimized ingress/egress

          • Space efficiency with ReFS Compaction

          • Performant Spaces Direct Multi Resilient Volumes (MRV)

        • Hyper-converged Scale

          • Cluster Sets: Significantly increases hyper-converged SDDC cloud scale by grouping multiple clusters into a larger fabric

        • Hardware support

          • Support for Storage Class Memory (SCM) in Spaces Direct

      Here are the new features:

      Persistent Memory can now be exposed to Hyper-V VMs:

      • In this build, NTFS-formatted direct access volumes that are created on non-volatile DIMMs can now be exposed Hyper-V VMs. This enables Hyper-V VMs to leverage the low-latency performance benefits of Persistent Memory devices.

      • Virtualized Persistent Memory (vPMEM) is enabled by creating a VHD file (.vhdpmem) on a direct access volume on a host, adding a vPMEM Controller to a VM, and adding the created device (.vhdpmem) to a VM. Using vhdpmem files on direct access volumes on a host to back vPMEM enables allocation flexibility and leverages a familiar management model for adding disks to VMs.

      • PowerShell can be used for the creation and management of Virtualized Persistent Memory.

      Battery Passthrough:

      • With new additions to Set-VM, a PowerShell cmdlet, you can now enable and disable Battery Passthrough, a new feature. Battery Passthrough let your VMs have the same battery state as the host they are on. To use this feature of Set-VM, use the flag -BatteryPassthroughEnabled {$true, $false}. This option is only available for version 8.2 virtual machines.

      Improvements to Container Networking:

      • This build introduces enhancements to container networking to better support Kubernetes by adding support for multiple containers (w/out Hyper-V isolation) to a single Pod (Network Compartment) as well as only requiring a single endpoint per Pod for all traffic types (e.g. ingress and East-West)

      • The Host Networking Service (HNS) now has support for creating ACL, NAT, and Load Balancing network policies for Container endpoints for fine-grained policy application.

      RDMA for Trusted Guests:

      • This build includes several enhancements for (Trusted) Guest RDMA to enable low-latency storage access with zero CPU usage by Trusted Guest VMs – this is ideal for running Windows File Servers in a Guest to accelerate file serving. Requires updated NIC drivers.

      Improvements to Software Defined Networking:

      • Encryption can be enabled for virtual network subnets to protect your traffic from anyone with physical access to the wire, including network administrators.

      • Failover time for SDN gateways is improved. Now, you will observe much faster failover times for the gateways, even with high number of connections.

      • Access control lists can be applied for infrastructure on logical subnets.

      Improvements in Networking transports:

      • 2X throughput improvement for single connection TCP and UDP performance in low latency intra-datacenter scenarios

      • Default congestion control algorithm CUBIC for high speed networks

      Improvements in HTTP(s):

      • SSL throttling to enable predictable service for established connections, in the face of high incoming SSL traffic.

      • Deterministic certificate updates for HTTPS enabling greater service availability.

      Improvements in time accuracy:

      • Pressing EU regulations in 2018 require strict time precision and traceability. Win32tm improvements in RS3 support greater time accuracy, and jitter is removed from the measurements that calibrate the service.

      • New system event logging lets you archive time service data to support traceability compliance.

      • System center monitoring now includes a new rule which lets you detect when a machine in your environment is out of compliance.

      Nano Server optimized for Containers:

      • Nano Server is now a container only option and optimized for containers, more information is available in the Delivering continuous innovation with Windows Server blog post. To optimize for containers, several features were removed that were in the Nano Server base image in Windows Server 2016, these include WMI, PowerShell, .NET Core, and the Servicing stack, which has significantly reduced the image size.

      Server Core base image optimizations:

      • The Windows Server Core base image has been optimized saving over 20% download and on disk space.

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