are you using msn messenger 3.0 for osx? if so it should automatically let u send/receive files...BUT...if your behind a firewall, then its usually the main problem, its a HUGE problem on windows, so it may be a problem on mac also....
Yep, I am using V.3 for OSX. I just get a message saying it has been blocked. I do have a firewall but I have tried disabling it + but just get the same message. It would be really useful though if it worked! I'm sure there must be an easy fix.