The exporter is an add-in to a 3D CAD product. These are used to export your 3D model to a QuadriSpace model (QSM) file directly from the 3D CAD software. This file can then be imported into any QuadriSpace product for content creation, distribution and collaboration.
In general, yes. Pages3D and Publisher3D include the ability to import Rhino files. This native import ability is included with the regular installation programs.
Maybe not. Since all QuadriSpace content creation software includes native importers for Rhino files, you may be able to get the best results by just importing the 3D model. However, there are cases where the exporter is better. You may need Exporter if: