Not directly related to your question but there is one difference between the KEYs from on line renewal and purchased as part of retail boxed copy -- the Norton online KEY adds it's time to any unexpired time on your installed copy while the "boxed" KEY wipes that unexpired time out .... although we have reports that those nice people at OnLine Chat Customer Support will sometimes add the days back on for you if you ask ....
And of course there is a tremendous difference in price very often if you can catch a retail offer with good rebates -- but only buy from reputable sources since we have reports here from people who bought on line and found the KEY was already used or othewise invalid. Sometimes that does not show up immediately when you activate .....