In addition to the Office-related components for Visual Studio 2005, there were earlier versions for Office XP / Visual Studio .Net 2003 (Download details: Office XP Primary Interop Assemblies (PIAs)). I'm not sure VSTO works with Office 2000 at all.
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This sounds like you have to do special configuration and maybe extra work to develop for Office 2000 in .Net: Office Developer Center: Microsoft .NET Development for Microsoft Office: Chapter 2 (Part 1 of 3)



