Hmmm... don't think my fiance would like to reference me as an authority on tail chasing.

As for the SID stuff well there are a few members on the board that have similar knowledge as myself in that area.

All accounts have a SID local or network. What internal methods M$ employs for cleanup of local vs network I'm not sure. Though I suppose unlike Howard, I have seen SID within Global Groups from accounts that no longer existed (if that is in fact what Howard is saying - that he has not seen them in Global Groups)