Be aware that Aimoo will only migrate the first three pages of boards, and only a few photo albums Jody. On the outside it may look identical to MSN but when you try opening any picture beyond the first few albums or go beyond three pages, nothing happens. With Aimoo you can't add anything to the migrated board.
Yuku is a little better in that you can add posts to the history but you still don't get it all. Thus far it seems Multiply is the best bet for migration though all boards will be merged into one. Thanks to MSN, now I know how a baby feels when its thrown out with the wash!