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I am currently working on an Excel 2010 add-in which formerly was an Excel 2007 add-in. Somewhere in the process of switching computers, the add-in was converted i think. Some of my customers stated that the add-in wasn't working on Excel 2007 anymore so I tried to debug it in a VirtualBox with Excel 2007 and Visual Studio 2010 installed. Now I get the Error Message: You cannot debug or run this project, because the required version of the Microsft Office application is not installed. I started a new Excel 2007 add-in project and tried to find what the differences are and came up with the idea that it somewhat has to do with the dll's so I changed my 2010 addin until it looked like an 2007 addin. I still get the error message stating that my project can't be debugged. Is there anything I could've forgotten to change. Writing a completely new addin is unfortunately not an option. These questions haven't helped me so far: Excel Addin that works on Excel 2007 and 2010 Deploying Office 2010 addin

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