Thoughts about setup and deployment issues, WiX, XNA, the .NET Framework and Visual Studio
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with no warranties, and confer no rights. Additionally, views expressed
herein are my own and not those of my employer, Microsoft.
The Windows Phone SDK 8.0 supports XNA Windows Phone game projects that target Windows Phone OS 7.1. It does not support XNA Windows Phone game projects that target Windows Phone OS 7.0. However, it does not block you from trying to open XNA projects that target Windows Phone OS 7.0. Instead, it will allow you to open the projects and try to build them, and then you will see error messages about missing reference assemblies.
In order to open and use your XNA projects that target Windows Phone OS 7.0 in the Windows Phone SDK 8.0, you must first upgrade them to target Windows Phone OS 7.1. You can perform this upgrade in one of the following ways: