Microsoft Deployment Toolkit (MDT) build 8443

The Microsoft Deployment Toolkit (MDT), build 8443, is now available on the Microsoft Download Center. This update requires the Windows Assessment and Deployment Kit (ADK) for Windows 10, version 1607, available on the Microsoft Hardware Dev Center (adksetup.exe file version 10.1.14393.0).

You may notice that we are not tagging this release with a year or update version. To better align with the current branches of Windows 10 and Configuration Manager, and to simplify the branding and release process, we are now just referring to it as the “Microsoft Deployment Toolkit”, using the build number to distinguish each release. This is not necessarily a “current branch” of MDT; we are committed to updating MDT as needed with revisions to Windows, the Windows ADK, and Configuration Manager.

Here is a summary of the significant changes in this build of MDT:

  • Supported configuration updates
    • Windows ADK for Windows 10, version 1607
    • Windows 10, version 1607
    • Windows Server 2016
    • Configuration Manager, version 1606
  • Quality updates
    • Deployment Wizard scaling on high DPI devices
    • Johan’s “uber bug” for computer replace scenario
    • Multiple fixes for the Windows 10 in-place upgrade scenario
    • Several fixes to Configure ADDS step
    • Removed imagex/ocsetup dependencies, rely solely on DISM
    • Includes the latest Configuration Manager task sequence binaries (version 1606)

Windows 10 1607 Windows Update Change

For those of you who have started deploying Windows 10 1607, you might notice a change in the behavior of the Windows Update agent for PCs that are configured to pull updates from WSUS.  Instead of pulling the updates from WSUS, PCs may start grabbing them from peers on your network, leveraging the Delivery Optimization service for referrals to other PCs that have already obtained the content.  This change should generally help reduce the amount of network traffic being generated for both quality (monthly) updates and feature updates, offloading that traffic from the WSUS server.  It will add some additional traffic between each client PC and the Delivery Optimization service on the internet, as it has to talk to this internet-only service in order to get a list of peers.

If the Windows Update agent can’t talk to the Delivery Optimization service (due to firewall or proxy configurations), or if there are no peers able to provide the content, it will then go ahead and grab the content from the WSUS server.

There is a new Group Policy setting available if you want to disable this behavior, e.g. because you are already using BranchCache for peer-to-peer sharing.  To do this, you need to set the “Download Mode” policy under “Computer Configuration –> Administrative Templates –> Windows Components –> Delivery Optimization” to specify “Bypass” mode, which will result in the client always using BITS to transfer the content from WSUS (with BranchCache jumping in to provide the peer-to-peer capabilities through its integration with BITS):


Of course to set this policy, you need the latest ADMX files, which can be downloaded from and are also included in Windows 10 1607 and Windows Server 2016.  (The “Bypass” setting wasn’t available in previous versions.)  See for details on how to update the Group Policy central store with these latest ADMX files, if you are using a central store.