Symantec Data Center Security - Very Urgent Question

Good Day all,

  We're working on a project that requires Moving from Windows Server 2003 to Windows sever 2013.

The Customer will 1st move from 2003 to 2010 for some time to migrate all the accounts to be ready to move to 2013.

So he needs to internally secure the E-mail traffic and he works with 8 servers; 4 active and 4 Back up.

So i need to know how many licences of SDCS: SA to secure the 8 servers ( using Wind Serv 2010) and if they will be supported till 2013 using the same licenses????

I DO REALLY APPRECIATE UR PROMPT RESPONSE as we're runnning out of time :)