Upgrading a small Win2k3 lan

Client has 5 workstations plus a Windows 2003 server. Their subscription for NOD32 business version is coming up for renewal.I understand that I can either stay with version 4 of antivirus. if I choose to version 5 I will have to use Endpoint Antivirus for the workstations and File Security for MS Windows Server. If I decide the latter does the upgrade to the Server version cost anything in this example?

 

ESET File Security and ESET Endpoint Antivirus use the same licensing credentials so there's no extra charge for ESFSW over what you're paying for ESET NOD32 BE v.4

 

I have been told that ESET starting with version 5 of NOD32, will now be charging for the number of servers and number of workstations separately. In the past I was able to buy 5 seats of the Business Edition of NOD32 and use one of these seats on their Win2k3 server. Now I will have to buy a server version ( File Security for MS Windows Server) and limit the use of the Endpoint Antivirus to the workstations only.