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Visual studio suggest to create different VSTO project for outlook 2010 and outlook 2013 like a picture. However my Addin for outlook 2010 also works and for 2013. Any body know about different in these approaches? enter image description here

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The difference is that Outlook 2010 interops will be used in the project. So, IntelliSense will not show you methods and properties introduced in latest (Outlook 2013) versions.

See Running Solutions in Different Versions of Microsoft Office for more information.