Microsoft Silverlight will reach the end of support on October 12, 2021. Silverlight development framework is currently only supported on Internet Explorer 10 and Internet Explorer 11, with support for Internet Explorer 10 ending on January 31, 2020. There is no longer support for Chrome, Firefox, or any browser using the Mac operating system.

Frequently Asked Questions

Microsoft will provide technical help for customers using versions of Silverlight 5 only. Paid technical help is available to customers requiring support with issues beyond install and upgrade. Microsoft will continue to ship updates to the Silverlight 5 Developer Runtime for supported browser versions given that their extensibility model supports plug-ins; this includes updates for security vulnerabilities as determined by the Microsoft Security Response Center (MSRC).

Silverlight 5 will support the browser versions listed on the system requirements page through October 12, 2021, or though the lifecycle of the underlying browsers, whichever is shorter. The support page will be updated to reflect compatibility with newer browsers and operating system versions.

Silverlight’s lifecycle policy is independent from the Windows 7 policy. After January 14, 2020, customers using Silverlight on Windows 7 will no longer be supported and will no longer receive automatic security updates.

Microsoft is not planning to take any specific action to terminate Silverlight applications. After this date, however, Silverlight will be in an unsupported state and will not receive any future quality or security updates.

Silverlight’s license is a perpetual license and is not tied to the continuation of support. While support will be ending in October 2021, this date does not affect the license, which continues in effect for as long as the customer is using the software and complies with the terms of the license.

There are no plans for extending Silverlight support beyond the existing support dates listed here.

The microsoft.com/silverlight website will still be available. However, the Silverlight installer will no longer be available after the end of support date of October 12, 2021.

There are various options for migrating applications from Silverlight. We recommend that you evaluate the requirements of the application that you are migrating and determine the technology that best suits the application in question:

  • If your application is non-browser dependent and you’d like to migrate to a Windows Desktop application, we recommend you migration your application to WinUI 3 with the Windows App SDK.

  • If your application is web-based, we recommend that you look into Blazor, which allows re-usability of .NET Silverlight code. Blazor lets you build interactive web UIs using C# instead of JavaScript. Blazor apps are composed of reusable web UI components implemented using C#, HTML, and CSS. Both client and server code are written in C#, allowing you to share code and libraries.

After the IE desktop application is permanently disabled, Silverlight applications will continue to function in Microsoft Edge IE Mode. IE mode supports all document and enterprise modes, Active X controls (such as Java or Silverlight), and more. For a list of what is supported and what is not supported, see the What is Internet Explorer (IE) mode Docs page. 

The Silverlight installer is not licensed for redistribution. 

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