Just updated NOD32 AV to 4.0.474 from the previous one. I didn't observe the date of signature file before this program update. So I can't say how was the date of signatures directly before this procedure. But I assume that was up to date - I didn't have probs with signature update. After the program update completed I could see the date of signatures was something like 20091122. Is this true? Does NOD32 AV installer really overwrite the installed signatures with those it brings along, regardless which of the both is newer? The logical strategy would be to leave untouched the signatures already present in NOD32 installation if this is up to date.