I have to tell you, if this is just for personal use and you're not going to redistribute, you may not need to export from poser at all - you can copy the base OBJ file that the figure is built from, and simply morph that.  You still need to watch out for Poser's uber tiny scale, but otherwise I found this worked for me.
http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2698187&page=2

The result is not too useful to anybody outside yourself though.
edit: looking back on that I now realize several of those steps are redundant :rolleyes:

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