Norton 360 Obsolete?

Our company (~12 computers) likes using Norton 360 (3 license/box) for our security needs.  

The majority of our installs are expiring late this year but we still have enough 360 box licenses to renew them for another year.  The question I have is that I don't see N360 being updated with new versions (other than bug fixes) because it has been replaced by Norton Internet Security.

Is there a way to convert our unused box licenses over to the NIS package equivalent that is running the newer protection engines?

Thanks

Clint