Based on your down-thread comment, I'm guessing that you never actually developed for Netscape 4.x (or 3.x for that matter) and are basing this entirely on a single comment from a non-technical person at a single company. Keep in mind that it's quite possible that Scottstrade's tech team was crap, and that's why they were having issues. It's also quite possible that you're talking about "Netscape 6.x vs IE 6.x" instead of "Netscape 3.x/4.x vs IE 5.x".
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Based on your down-thread comment, I'm guessing that you never actually developed for Netscape 4.x (or 3.x for that matter) and are basing this entirely on a single comment from a non-technical person at a single company. Keep in mind that it's quite possible that Scottstrade's tech team was crap, and that's why they were having issues. It's also quite possible that you're talking about "Netscape 6.x vs IE 6.x" instead of "Netscape 3.x/4.x vs IE 5.x".