I created some VB.NET VSTO based addins for Word and Excel and from VBA can access the various methods using COMAddins collection. When I try and use the VBA CreateObject it fails with an error message saying "ActiveX Component cannot create object". Anyone know how to get around this but note the code in the VBA is not allowed to be modified. IS there some interface that needs to be used in the VSTO addin. I am using <ComVisible(True)>