Welcome to the Excel 2010 Primary Interop Assembly Reference
The Microsoft Excel 2010 Primary Interop Assembly (PIA) Reference provides help for developing managed applications for Excel. It extends the Excel 2010 Developer Reference from the COM environment to the managed environment and focuses on how to use the PIA.
Publish date of this reference: April 2010 (version 2010)
Accessing the Excel PIA Reference in Design Time
If you use Microsoft Visual Studio 2008 Tools for the 2007 Microsoft Office System or Office development tools in Visual Studio 2010 and you are connected to the Internet, you can access context-sensitive Help when you press F1 in the Visual Studio integrated development environment (IDE). This Help content is the Excel 2010 PIA Reference on MSDN.