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Merged PR 13067: Updated servicing stack update article

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Liza Poggemeyer
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windows/deployment/update/servicing-stack-updates.md
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@ -7,7 +7,7 @@ ms.sitesec: library
author: Jaimeo author: Jaimeo
ms.localizationpriority: medium ms.localizationpriority: medium
ms.author: jaimeo ms.author: jaimeo
ms.date: 11/13/2018 ms.date: 11/29/2018
--- ---
# Servicing stack updates # Servicing stack updates
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**Applies to** **Applies to**
- Windows 10 - Windows 10, Windows 8.1, Windows 8, Windows 7
## What is a servicing stack update? ## What is a servicing stack update?
The "servicing stack" is the code that installs other operating system 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 does not 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. The CBS is a small component that typically does not 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?
Having the latest servicing stack update is a prerequisite to reliably installing the latest quality updates and feature updates. Servicing stack updates improve the reliability and performance of the update process. 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.
## When are they released? ## When are they released?
Currently, the servicing stack update releases are aligned with the monthly quality update release date, though sometimes they are released on a separate date if required. Servicing stack update are scheduled to release simultaneously with the monthly quality updates. 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."
>[!NOTE] >[!NOTE]
>You can find a list of servicing stack updates at [Latest servicing stack updates](https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/ADV990001). >You can find a list of servicing stack updates at [Latest servicing stack updates](https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/ADV990001).
## 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?
Both Windows 10 and Windows Server use the cumulative update mechanism, in which many fixes are packaged into a single update. Each cumulative update includes the changes and fixes from all previous updates. Both Windows 10 and Windows Server use the cumulative update mechanism, in which many fixes to improve the quality and security of Windows are packaged into a single update. Each cumulative update includes the changes and fixes from all previous updates.
However, there are some operating system fixes that aren’t included in a cumulative update but are still pre-requisites for the cumulative update. That is, the component that performs the actual updates sometimes itself requires an update. Those fixes are available in a servicing stack update. For example, the cumulative update [KB4284880](https://support.microsoft.com/help/4284880/windows-10-update-kb4284880) requires the [May 17, 2018 servicing stack update](https://support.microsoft.com/help/4132216), which includes updates to Windows Update. Servicing stack updates must ship separately from the cumulative updates because they modify the component that installs Windows updates. The servicing stack is released separately because the servicing stack itself requires an update. For example, the cumulative update [KB4284880](https://support.microsoft.com/help/4284880/windows-10-update-kb4284880) requires the [May 17, 2018 servicing stack update](https://support.microsoft.com/help/4132216), which includes updates to Windows Update.
If a given cumulative update required a servicing stack update, you'll see that information in the release notes for the update. **If you try to install the cumulative update without installing the servicing stack update, you'll get an error.**
## Is there any special guidance? ## Is there any special guidance?
Typically, the improvements are reliability, security, and performance improvements that do not require any specific special guidance. If there is any significant impact, it will be present in the release notes. 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 do not require any specific special guidance. If there is any significant impact, it will be present in the release notes.
## 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.
* Installing servicing stack update does not require restarting the device, so installation should not be disruptive. * Installing servicing stack update does not require restarting the device, so installation should not be disruptive.
* Servicing stack update releases are specific to the operating system version (build number), much like quality updates. * Servicing stack update releases are specific to the operating system version (build number), much like quality updates.
* Search to install latest available [Servicing stack update for Windows 10](https://support.microsoft.com/search?query=servicing%20stack%20update%20Windows%2010). * Search to install latest available [Servicing stack update for Windows 10](https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/ADV990001).