Microsoft Visual Studio 2005 Tools for the 2007 Microsoft Office System (also known as â??Visual Studio 2005 Tools for Office Second Editionâ?? or â??VSTO 2005 SEâ??) 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.

VSTO 2005 SE includes support for Microsoft Office InfoPath 2007 form template projects, previously available as a separate product known as the Microsoft Office InfoPath 2003 Toolkit for Visual Studio 2005. You can now design InfoPath 2007 form solutions right in the Visual Studio 2005 environment if you have InfoPath 2007 installed on your computer.