it was probably originally put in there by M$ with the intent on being solely a backup account, so that techs and stuff could access the comptuer and set up accounts or whatever is the user forgot their password.

after that, it became an exploit.

for all the noobs who tried to neg me with their grey AP's:
upon posting this, it wasn't just because i figured it out, i just happened to be working on someone's new laptop, and i remembered to change the pword. I just wanted to give a heads up to the unknowing amongst the AO community.