Help with Extended Mapi and VB.net

Does anyone have some pointers or code on getting deep with extended mapi and vb.net?

Specifically I am trying to get the original recipient from a returned undelivarable receipt in a outlook 2000 exchange 5.5 folder.

I can get all the returned receipts but the original recipient is only available through extended mapi (at least as far as my research has shown) and the only tool I can find for this is redemption which is not free for business use. I have started a code class to deal with this and other objects with extended mapi but this is not a area I am great at.

Any help would be appreciated.

Thanks

Dean

As far as i know you cannot use extended mapi in vb.net or c#. we had similar need and had to get c++ programmer to write libraries for us to use.