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50 lines
3.2 KiB
Markdown
50 lines
3.2 KiB
Markdown
---
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title: Servicing stack updates (Windows 10)
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description: Servicing stack updates improve the code that installs the other updates.
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ms.prod: w10
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ms.mktglfcycl: manage
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ms.sitesec: library
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author: Jaimeo
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ms.localizationpriority: medium
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ms.author: jaimeo
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ms.date: 09/24/2018
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---
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# Servicing stack updates
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**Applies to**
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- Windows 10
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## What is a servicing stack update?
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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.
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## Why should servicing stack updates be installed and kept up to date?
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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.
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## When are they released?
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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.
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## What's the difference between a servicing stack update and a cumulative update?
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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.
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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.
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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.**
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## Is there any special guidance?
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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.
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## Installation notes
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* 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.
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* Installing servicing stack update does not require restarting the device, so installation should not be disruptive.
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* Servicing stack update releases are specific to the operating system version (build number), much like quality updates.
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* Search to install latest available [Servicing stack update for Windows 10](https://support.microsoft.com/en-us/search?query=servicing%20stack%20update%20Windows%2010).
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