Migrating your Windows Store app to Windows 8.1

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Windows 8 introduced the world to the Windows Runtime and WinJS for building Windows Store apps. Windows 8.1 introduces a number of changes and improvements to the Windows Runtime and WinJS to help you make more exciting and better performing apps. This guidance helps you understand the improvements and changes to the platform so you can easily transition your XAML, HTML with JavaScript, or DirectX-based Windows 8 code investments to Windows 8.1.

This topic first introduces basic migration steps, then describes ways to improve your app's performance, and ends with features and controls that are new to Windows 8.1 and might make great additions to your existing app.

To get insight of the how to migrate Windows Store app built for Windows 8 to Windows 8.1 please check the link