In an effort to optimize our small business portfolio and remove redundant offerings, Symantec has decided to End of Life the Symantec Endpoint Protection Small Business Edition 12.1.X* product. 12.1.5 is the latest version of Symantec Endpoint Protection Small Business Edition 12.1.X* product. All customers currently on this product will have their licenses automatically upgraded to our newest Symantec Endpoint Protection Small Business Edition product (formerly known as SEP SBE 2013) at a 1:1 ratio, with the option for on-premise or cloud-based managed versions. Note: customers migrating from SEP SBE 12.1.X to SEP SBE will move from a perpetual license to a subscription license beginning May 4, 2015.
Please check the following link for more details: http://www.symantec.com/docs/DOC8217