The index.dat file was in the cookies folder in IE5.5 and i'm sure it was there in IE5.
BTW, I've been using IE6 for 3 days now inconjuction with Win 98se, BT homehighway and BT anytime can't really say i've noticed any difference a few extra's and no problems ...so far. i've been on and off the net loads of times aswell.
[ 05 September 2001: Message edited by: KwikPhix ]