The poses wont import into Poser. The expressions, however will. When Posing inside Poser use the -ShoulderBend, ForearmBend, rather than the ShoulderTwist or the Forearmtwist..same with all body parts. I found the "bend" parts work much better..it does take some playing with to find what works best. Ibr_Remote (Infinity10) posted the FBX settings over at the SmithMirco forum.

Here it is:

Hope this helps!!