Hi Alligator, see these previous threads for some discussion:

http://moi3d.com/forum/index.php?webtag=MOI&msg=3136.1
http://moi3d.com/forum/index.php?webtag=MOI&msg=3652.1
http://moi3d.com/forum/index.php?webtag=MOI&msg=3401.1

For something that's easy to use and pretty inexpensive, check out SimLab composer:
http://www.simlab-soft.com/3d-products/simlab-composer-main.aspx

To export from MoI to SimLab composer, use OBJ format and set the option for "Export: Quads & Triangles" in the meshing options dialog that pops up when you do the export.

- Michael