Sign in with Microsoft
Sign in or create an account.
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.


Microsoft Silverlight is a cross-browser, multi-environment plug-in that delivers the next generation of Microsoft .NET–based media experiences and rich interactive applications for the web. This article describes an update for Silverlight. This update was released on September 1, 2010.


An update is available for Microsoft Silverlight. This update offers a new build that is an upgrade to earlier versions of Silverlight. This update is included in current Silverlight installers. If your computer does not have Silverlight installed, the installer will be offered to you by Microsoft Update or by Windows Server Update Services (WSUS).

This update includes functional, performance, reliability, and security improvements. This update is backward-compatible with applications that were created by using earlier versions of Silverlight.

More Information

Issues that are fixed by this update

Issue 1

This update improves the native extensibility of media stream source that uses the Silverlight technology and the Expression Encoder.

Issue 2

This update enables new Add Row functionality in the Silverlight DataGrid control.

Issue 3

This update enables you to increase the isolated storage size through registry keys or Group Policy settings.

Issue 4

This update improves the startup performance of applications on a computer that enables the Silverlight technology.

Issue 5

This update adds the mouse wheel support for out of browser applications on a computer that is running a Mac operating system.

Issue 6

This update resolves a security issue. Playback of PlayReady-protected content through a remote desktop connection or a terminal session is now disabled.

Issue 7

Fixed various memory leaks including:

  • Memory leaks that occur when mouse capture is used. For example, memory leaks that occur when you use CaptureMouse() in drag-and-drop scenarios. For more information, see the following Microsoft Silverlight forums discussion.

  • Memory leaks that occur when UserControl cannot be garbage-collected because it contains inline data template. For more information, see the following Microsoft Silverlight forums discussion.

Installation information

This update is available from the following sources.

Microsoft Silverlight site

The Silverlight installer includes all previous updates in addition to this update. To install the latest version of Silverlight, visit the following Microsoft website:

Microsoft Update

This update is also available to users of Microsoft Update. If you have an earlier version of Silverlight installed, this update will be offered as "Update for Microsoft Silverlight (KB 2164913)."


For more information about Silverlight, visit the following Microsoft websites:


If this article does not answer your question, click this button to pose your question to other community members at Microsoft Community:

Ask a question

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Was this information helpful?

What affected your experience?
By pressing submit, your feedback will be used to improve Microsoft products and services. Your IT admin will be able to collect this data. Privacy Statement.

Thank you for your feedback!