November 7 . 2001
"NPCs that used to /consider green but gave experience will now /consider light blue, as well as NPCs of slightly lower level than those greens. You will always get experience for something that is light blue.
You will not receive experience for greens."
http://www.tski.co.jp/baldio/patch/20011107.html
it would be nice to skillup off green mobs, considering lots of folks grind these guards for cash. i wouldnt mind this being left in.