Updated February 28, 2019: This change does not affect SAC-T for Office 365 ProPlus customers. See below for details.
In my post last May on Windows 10 and the “disappearing” SAC-T, I explained how we simplified and aligned our Windows servicing terminology with Office, reflecting that there are two Semi-Annual Channel (SAC) releases each year. I also explained that with Windows, there was never actually a Semi-Annual Channel (Targeted), or SAC-T, release; rather, SAC-T merely reflected a milestone for the semi-annual release. Unless you were using Windows Update for Business, the SAC and SAC-T designations had no impact on when your devices would be updated. At the time, we had not yet completed the work necessary to deliver the changes needed for Windows Update for Business to reflect the alignment with Office so we continued to show dates for both the SAC and SAC-T milestones on the Windows 10 release information page.
We have now completed that work. Beginning with Windows 10, version 1903 (the next feature update for Windows 10), the Windows 10 release information page will no longer list SAC-T information for version 1903 and future feature updates. Instead, you will find a single entry for each new SAC release. In addition, if you are using Windows Update for Business, you will see new UI and behavior to reflect that there is only one release date for each SAC release. If you use System Center Configuration Manager, Windows Server Update Services (WSUS), or other management tools, there will now only be one feature update published to WSUS, and this will occur at the time of release. (Note: This change does not impact the availability of SAC-T for Office 365 ProPlus. The SAC-T channel will continue to be an option for Office 365 ProPlus customers. For more information, see Overview of update for channels for Office 365.)
With this upcoming change, Windows Update for Business customers may have a few questions and I’ll try to address those now. To restate what I said above, unless you are using Windows Update for Business, the changes discussed below have no impact on when your devices get updated.
For releases prior to version 1903, Windows Update for Business customers had two settings they could utilize to designate when feature updates should be installed on their devices. The first was the branch readiness level (SAC or SAC-T), and the second was the deferral period, which specified the number of days after the branch readiness level-based date before an update was offered to a device.
Once your organization’s devices have been updated to Windows 10, version 1903, the configuration of Windows Update for Business will be simpler, enabling you to choose a single deferral value based solely on the SAC release date. That means, if you are trying to set up validation flights in your environment using Windows Update for Business, or stage updates in waves, you will do so from a common release start date, which should simplify the deployment process overall.
I want to clarify; with these changes, we will not change your deferral value. Instead, it will remain as it was configured following the update to version 1903. In addition, while all Windows Update for Business device deferrals will now be based on the release date (you will no longer have to configure this), you will continue to have the option to enroll devices in the Windows Insider Program and choose a pre-release ring, such as Slow, Fast, or Release Preview.
The image below shows the Settings panel as it looks today with Windows 10, version 1809.
When version 1903 is released, it will look like this:
As you can see, it shows only pause and deferral settings; Semi-Annual Channel (Targeted) is no longer presented as an option. Again, this change will only be seen once you have deployed Windows 10, version 1903 and will only impact future feature updates after version 1903. Devices enrolled in the Windows Insider Program; however, can already see these changes.
As I said above, with version 1903, we will cease to publish both SAC and SAC-T dates. Each release will have a single SAC release date so we will handle this one-time transition in the following manner:
For future upgrades beyond Windows 10, version 1903, to establish an additional delay and recreate your deployments rings on the schedule you want, you will need to update your deferral value. Using the same example above, you would change the deferral value from 30 to 90 days. Or, if you want to create a three-ring deployment model, you could have three groups of devices, designated simply with deferral values from the single release date, perhaps 30, 60, and 90 days.
If you’re interested in learning more, or would like to see how you can use tools like Configuration Manager, WSUS, or Windows Update for Business to manage updates, see the Quick guide to Windows as a service. To learn more about Windows as a service, check out the Windows as a service gateway on Docs.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.