Michael, a test file for you...

http://www.divshare.com/download/141229-dfa

The above link is a ZIP file (7MB) of a 24.7MB model. I want this model exported as obj or 3ds (I think 3ds is easier and smaller file) but this can't be done because MoI seems to freeze. Actually, when checking Task Manager->Applications then I see that Moi is not responding but in the Processes tab I see that Moi.exe is still moving (changing the number of used memory).
I am using a Dual P4 3GHz with 2G Ram so my system is not the problem.
I started with a bigger file (more cubes, size 80Mb). I was expecting this one to work.

P.S. Working with this file is very difficult unless you use one view at a time. Split mode reminds me of my 386 system...