DELETE THEM
write them down store them somewhere offline in hardcopy if you need to - do not ever store your account or game passwords in your hotmail account (preferably not any email account - and don't store them on your computer, if you get a trojan horse you could get them stolen, or you might end up sharing them on kazaa by accident).
It's just asking for someone to hack you.
Store them in hard copy somewhere safe if need be - that way at least you know it was your brother/mother/dog that stole your chars
passwords in hotmail = hacked
just ask Gracie or Galoecjunior or any of the others that have had their hotmail cracked and their accounts stolen/ripped off (check on Barrysworld - there was a rash of it on Prydwen)