That's a very misleading statement. I tried this and NOD32 always caught even repacked samples. NOD32 uses a generic unpacker so it obviously must catch them.
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I too wonder why KAV should be better than NOD32 if it hasn't saved me from email threats without updating signatures (which took a couple of hours). Luckily I'm using also NOD32 which always picked up all email threats without needing to update...
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