Hi - Although the tool doesn't support this - I managed to hack the output so it worked for me.
Process is this:
- export in moss
- rename to .cab
- extract cab
- fix up the xml file as described here: http://moss-arvit.blogspot.com/
- re-cab with the "Cab-Arc" tool from "CL Tools": http://www.softpedia.com/get/Others/Miscellaneous/CL-Tools-4Win.shtml
- rename back to cmp or whatever it was
- import into 2010
- sit back and have a beer and think how awesome that was.