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Там написано, что это add-on к VSTO 2005:
"Microsoft Visual Studio 2005 Tools for the 2007 Microsoft Office System (also known as “Visual Studio 2005 Tools for Office Second Edition” or “VSTO 2005 SE”) is an add-on to Microsoft Visual Studio 2005 that enables you to build application-level add-ins for applications in the 2007 Microsoft Office system and the Microsoft Office 2003 System.
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