If it has not been mentioned before,

Carrara6Pro (probably any version) just LOVES working with MoI stuff, especially in the Vertex(Poly) room.
I usually save as IGES files from MoI as it makes shading (shading domains) a breeze in Carrara.

Carrara6 Pro, MoI and 3D Brush (and PhotoshopCS3 Extended)

The only way to live!