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This article describes an update for Windows 8.1, Windows Server 2012 R2, Windows 7 Service Pack 1 (SP1), and Windows Server 2008 R2 SP1. Before you install this update, check out the Prerequisites section.

About this update

This package updates the Diagnostic and Telemetry service on existing devices. This package also supports applications that are subscribed to Visual Studio Application Insights. The content in this article was revised to more accurately reflect the functionality of the package and related Windows Service. 

About the Diagnostic and Telemetry service

Helping the overall application experience

The Diagnostic and Telemetry service collects diagnostics information about functional issues on Windows systems that participate in the Windows Customer Experience Improvement Program (CEIP). CEIP reports don't contain contact information, such as your name, address, or telephone number. This means CEIP won't ask you to participate in surveys or to read junk email, and you won't be contacted in any other way.  Windows users can make changes to their Windows CEIP participation in the Windows Customer Experience Improvement Program settings page by opening Control Panel and selecting Action Center > Change Action Center settings > Customer Experience Improvement Program settings.

Applications that have their own diagnostics and telemetry program such as Application Insights may depend on the service to transport the telemetry to Microsoft. Application users will be able to participate in these programs through the settings of the application.

Additional information

This update uses SSL (TCP Port 443) to download manifests and upload telemetry to Microsoft that uses the following DNS endpoints:



This update contains the following two manifests that are used by the service when the user participates in the Windows CEIP program or telemetry programs that are specifically managed by an application such as applications that use Application Insights.

  • telemetry.ASM-WindowsDefault.json


Note When an advanced user runs the System File Checker tool (sfc.exe) after installing this package, the two files that are listed above are unintentionally flagged as corrupted. There's no system effect or corruption when these files are flagged, and this issue will be fixed in a later service update.

Windows 7 support

The Windows 7 offering also supports the kernel updates that were deployed separately to Windows 8.1 through security update 3045999.

How to obtain this update

Important Do not install a language pack after you install this update. If you do, the language-specific changes in the update will not be applied, and you will have to reinstall the update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is provided as a Recommended update on Windows Update. For more information on how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Download Center

The following files are available for download from the Microsoft Download Center:

Operating system


All supported x86-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows Server 2012 R2

Download Download the package now.

All supported x86-based versions of Windows 7

Download Download the package now.

All supported x64-based versions of Windows 7

Download Download the package now.

All supported x64-based versions of Windows Server 2008 R2

Download Download the package now.

All supported IA-64-based versions of Windows Server 2008 R2

Download Download the package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Update detail information


To install this update, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows 8.1 or Windows Server 2012 R2. Or, install Service Pack 1 for Windows 7 or Windows Server 2008 R2.

Registry information

To apply this update, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update replaces previously released update 3022345.


See the terminology that Microsoft uses to describe software updates.

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