OMG lol,
u won't believe it, but just then i tried to do this because i was
transferring my msn contacts to another msn address and it wasn't working either, i even removed msn plus from memory and turned plugins off (then restarted msn) and it still wouldn't work. the only other thing i have done to my msn is add the games patch with the 2 new tabs (msg plus forums tab and the neowin tab)!!! I just got my gf then to do it for me and she has the latest of plus and msn messenger (she has no plus plugins tho) because i just updated it for her!!!
lol i can't believe that just happened when u had a problem as well