Poser and Studio are the only 3D applications that I know of that don't let you export a 3D object the same way you import it (I mean vertex count and order as well as file format)!

I have to wonder if that is by design rather than oversight. Afterall, if you could export in the same format as the original character it would be that much easier to create a new character based on the same mesh (like SP3 and V3). Maybe they really don't want to see that....