can i use my norton 360 (2013) product key on a norton 360 (2014)?
Yes you can. It is a free upgrade to new version.
But I should say you need not key in your product key, Simply "Check New Version" from the N360 Tray icon by Right Clicking.
It would be upgraded without any problem.
We have implemented a new login process tied to your Norton Account. Please see this forum thread for information on logging into your existing account.
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