Here you go.
https://www-secure.symantec.com/connect/forums/symantec-antivirus-10x-sav-will-reach-end-support-life-eosl-4-july-2012
As mentioned in the below link it is officially stopped.
http://www.symantec.com/security_response/definitions/download/detail.jsp?gid=savce
http://www.symantec.com/business/support/index?page=content&id=TECH178551
Extension related information
http://www.symantec.com/business/support/index?page=content&id=HOWTO73168
I understand that you do not have much options. Note that the scan engine used in these versions are very old and are not as efficient as SEP to handle infections.
You may have to get in touch with your Symantec account rep.
Hope this helps.