Cannot find Microsoft.Office.Interop Visual Studio

Look for them under COM when trying to add the references. You should find the reference below, and possibly Microsoft Outlook 15.0 Object Library, if you need that. There are similar libraries for Word, Excel, etc.:

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Update: The Object Library should contain the Interop stuff. Try to add this to a source file and see if it can now find what you need:

using Microsoft.Office.Interop.Outlook;

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