C# Exchange Event Sink ISmtpInCommandSink

Hi again.  I am trying to make a CatchAll event sink for the SMTP ISmtpInCommandSink interface based on the instructions here:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnsmtps/html/writingmngsinks.asp

One problem is that Microsoft.Exchange.Transport.EventWrappers.dll isn't strongly named so my project won't compile.  I created a class library and set up the strong naming myself and then used my output as a reference in the main project and that let everything compile ok.

Now nothing works when I try to register the COM+ application.  First I got the error that the class wasn't derived from ServicedComponent, no problem right.  Now I'm getting this error:

TlbExp warning: Referenced type is defined in managed component, which is imported from a type library that could not be loaded because it was not registered (type: Microsoft.Exchange.Transport.EventInterop.ISmtpInCommandSink; component: c:\exchangesinks\catcharchive\microsoft.exchange.transport.eventinterop.dll).

I used regasm.exe on all of the necessary dll's and still nothing.
What am I missing?

I may even be open to paying for some consulting work at this point.
Thanks Dave