"Thumbs Up" to Alex above
Further supporting evidence in the article below:
http://www.symantec.com/docs/TECH143375
As it states, you need to have moved over onto Symantec Endpoint Encryption in order to maintain supportability. SEE itself doesn't hit EOSL until 2016 for the GE9.5.3 equivalent version, or 2017 for the latest:
http://www.symantec.com/business/support/index?page=releasedetails&key=55414
http://www.symantec.com/docs/TECH153772