Note: This FAQ is obsolete now as Norton does not endorse versioning anymore, but “up to date all the time” policy. This means that, as long as a user has an active subscription to Norton Security, the software will fully be up to date, that is, of the latest build (version).
If you need help in selecting the Norton software among the current Norton products, check our Norton Software Selection Guide page.
Generally speaking, higher version of any software brings improvements and new features when compared to the previous one. With Norton Security, one of the possible reasons why would one buy a lower version is a lower price. Right after purchase and installation of the product, the software can be upgraded to the latest version as all users of Norton Security are entitled to the latest version as long as their service subscription is valid. Saying this, if there’s a chance to buy some of the very old versions (hypothetically, a version from 3 or 4 years ago – Norton Security is not that old yet), it would be wise to check with Symantec’s support if such version would be entitled to free upgrade to the latest version. One version back should never be an issue, though.