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windows/deployment/update/servicing-stack-updates.md
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@ -21,15 +21,16 @@ ms.date: 12/31/2017
# Servicing stack updates # Servicing stack updates
## What is a servicing stack update? ## What is a servicing stack update?
Servicing stack updates provide fixes to the servicing stack, the component that installs Windows updates. Additionally, it contains the "component-based servicing stack" (CBS), which is a key underlying component for several elements of Windows deployment, such as DISM, SFC, changing Windows features or roles, and repairing components. The CBS is a small component that typically doesn't have updates released every month.
Servicing stack updates provide fixes to the servicing stack, the component that installs Windows updates. Additionally, it contains the component-based servicing stack (CBS), which is a key underlying component for several elements of Windows deployment, such as DISM, SFC, changing Windows features or roles, and repairing components. [CBS](https://techcommunity.microsoft.com/t5/ask-the-performance-team/understanding-component-based-servicing/ba-p/373012) is a small component that typically doesn't have updates released every month.
## Why should servicing stack updates be installed and kept up to date? ## Why should servicing stack updates be installed and kept up to date?
Servicing stack updates improve the reliability of the update process to mitigate potential issues while installing the latest quality updates and feature updates. If you don't install the latest servicing stack update, there's a risk that your device can't be updated with the latest Microsoft security fixes. Servicing stack updates improve the reliability of the update process to mitigate potential issues while installing the latest quality updates and feature updates. If you don't have the latest servicing stack update installed, there's a risk that your device can't be updated with the latest Microsoft security fixes.
## When are they released? ## When are they released?
Servicing stack update are released depending on new issues or vulnerabilities. In rare occasions a servicing stack update may need to be released on demand to address an issue impacting systems installing the monthly security update. Starting in November 2018 new servicing stack updates will be classified as "Security" with a severity rating of "Critical." Servicing stack update are released depending on new issues or vulnerabilities. In rare occasions, a servicing stack update might need to be released out of band to address an issue impacting systems installing the monthly security update. New servicing stack updates are classified as `Security` with a severity rating of `Critical`.
## What's the difference between a servicing stack update and a cumulative update? ## What's the difference between a servicing stack update and a cumulative update?
@ -38,14 +39,14 @@ Both Windows client and Windows Server use the cumulative update mechanism, in w
Servicing stack updates improve the reliability of the update process to mitigate potential issues while installing the latest monthly security update release and feature updates. If you don't install the latest servicing stack update, there's a risk that your device can't be updated with the latest Microsoft security fixes. Servicing stack updates improve the reliability of the update process to mitigate potential issues while installing the latest monthly security update release and feature updates. If you don't install the latest servicing stack update, there's a risk that your device can't be updated with the latest Microsoft security fixes.
Microsoft publishes all cumulative updates and SSUs for Windows 10, version 2004 and later together as one cumulative monthly update to the normal release category in WSUS. Microsoft publishes all cumulative updates and servicing stack updates for Windows 10, version 2004 and later together as one cumulative monthly update to the normal release category in WSUS.
## Is there any special guidance? ## Is there any special guidance?
Microsoft recommends you install the latest servicing stack updates for your operating system before installing the latest cumulative update.
Typically, the improvements are reliability and performance improvements that don't require any specific special guidance. If there's any significant impact, it will be present in the release notes. Typically, the improvements are reliability and performance improvements that don't require any specific special guidance. If there's any significant impact, it will be present in the release notes.
Most users don't need to install an isolated servicing stack update. In the rare case that you need to install an isolated servicing stack update, Microsoft recommends you install the latest servicing stack updates for your operating system before installing the latest cumulative update.
## Installation notes ## Installation notes
* Servicing stack updates contain the full servicing stack; as a result, typically administrators only need to install the latest servicing stack update for the operating system. * Servicing stack updates contain the full servicing stack; as a result, typically administrators only need to install the latest servicing stack update for the operating system.
@ -56,6 +57,6 @@ Typically, the improvements are reliability and performance improvements that do
## Simplifying on-premises deployment of servicing stack updates ## Simplifying on-premises deployment of servicing stack updates
With the Windows Update experience, servicing stack updates and cumulative updates are deployed together to the device. The update stack automatically orchestrates the installation, so both are applied correctly. Starting in February 2021, the cumulative update includes the latest servicing stack updates, to provide a single cumulative update payload to both Windows Server Update Services (WSUS) and Microsoft Catalog. If you use an endpoint management tool backed by WSUS, such as Configuration Manager, you'll only have to select and deploy the monthly cumulative update. The latest servicing stack updates will automatically be applied correctly. Release notes and file information for cumulative updates, including those related to the servicing stack, will be in a single KB article. The combined monthly cumulative update is available on Windows 10, version 2004 and later starting with the 2021 2C release, KB4601382. With the Windows Update experience, servicing stack updates and cumulative updates are deployed together to the device. The update stack automatically orchestrates the installation, so both are applied correctly. Starting in February 2021, the cumulative update includes the latest servicing stack updates, to provide a single cumulative update payload to both Windows Server Update Services (WSUS) and Microsoft Update Catalog. If you use an endpoint management tool backed by WSUS, such as Configuration Manager, you'll only have to select and deploy the monthly cumulative update. The latest servicing stack updates will automatically be applied correctly. Release notes and file information for cumulative updates, including those related to the servicing stack, will be in a single KB article. The combined monthly cumulative update is available on Windows 10, version 2004 and later starting with the 2021 2C release, [KB4601382](https://support.microsoft.com/kb/4601382).