It appears that Netscape corp is aware that the later versions suck, as they keep updating the 4.x version. I had a problem with 4.78 in that the mail files kept growing despite deleting entries and "compacting". 4.79 fixed this. 4.8 is less crash prone under windows2000.

Mozilla seems ok but lacks spell checking, which I use a lot. I've been using filtering for a while now, but it's getting hard to keep up.