I was using IE5 with W98 for a long time and everything was nice and stable with no problems, but my internet banking became a problem because of java issues. I was told I had to upgrade to IE6 and immediately ran into problems. This was a while ago now and I can't recall the exact nature of the problems, but I know it was enough for me to go back to IE5. But having had 6 on there, it didn't like going back to 5, or then trying to reinstall 6, and eventually I had to format my hard drive and start again. Since then everything has been working OK, but if it hadn't been for the Java I would have been quite happy to keep using 5. Certainly no discernible other benefits that I could see; change for the sake of change as usual from Microsoft.