This question is just as much for Norton Internet Security as it is for Norton 360:
When will Symantec stop development for NIS and N360 to operate in Windows XP?
I would think that the Norton products will still continue to support xp until Microsoft stops supporting the operating system.. This is just my opinion and not an official opinion from Symantec. Thanks.
And according to this Lifecycle link, Microsoft plans to end Extended Support of XP on April 8th, 2014. Then I guess I'll have to update