Oh, it's easy to convert 3DS MAX object to POSER.

 

Just export your 3DS MAX object with OBJ file format for POSER. You can see 'POSER'

preset obj. file when exporting OBJ.file from 3DS-MAX obj export window.

 

Of course export material library and texture at the same folder at where OBJ. mesh file saved.

 

Then at POSER, select File -> import -> wave front OBJ. Select your 3DS-MAX generated obj. It's all done. I love editing external meshs at 3DS-MAX and import

them to POSER oftenly because of 3DS-MAX's powerful mesh-element selection :)