I don't know. I don't have Poser 9, I have Poser Pro 2012 and 2014. 

According to Smith-Micro's website COLLADA is only available in Poser Pro, so I don't know why Poser 9 has a COLLADA export option listed. Maybe it's features are lmited in Poser 9, or its just an empty menu option that got overlooked in P9 (though logic tells me that's extremely unlikely). Worse case you can try it and see what happens. 

You will need to convert your rigged Poser figure to a single skin mesh before exporting via COLLADA. Does Poser 9 give you that option? It's under Figure > Skinning Method, the first option on the Figure menu.

In 2014 the Skinning options are Poser Traditional, Poser Unimesh and Simple Bones Single Skin - Interoperable. 

I'm not sure at this point what the differences are between Unimesh and Simple Bones options. I'll have to investigate that to find out. Or look through the manual and see. 

Might try seeing what your P9 user manual says about COLLADA. 

 

~Shane