So far, this is what the boards have seen:

1 298879 67.60% MSIE 6.0
2 77925 17.63% Mozilla/5.0
3 29144 6.59% MSIE 5.5
4 11830 2.68% Mozilla/3.01 (compatible;)
5 9626 2.18% MSIE 5.0

Everything below this was under a percentage point.