Norton Internet Security for Windows 2003 server

I don't know if this is the right place for my case, but if not indicate me where I can get the information.

 

My home computers (XP, Vista and Windows 7) are protected by the Norton Internet Security 2012 suite.

Recently I bought an old HP server with Windows 2003. This server will be connected to the internet and serve as mailserver, webserver and backup center. My previous 'server' was running under Windows XP and was protected by the Norton Internet Security.

But this suite does not work with the windows server versions, like 2003.

For windows servers, Symantec has the Norton Endpoint Protection.

If I understand correctly, the Endpoint Protection is another product. You buy the Endpoint Protection that you install on a server and you install the Endpoint Protection Client on each normal user computer.

 

Two questions:

1. If you want to buy this Endpoint Protection it requests that you give a number of users: For example If I take 1 user, can I then install on the server and install one Endpoint Protection client?

 

2. How does this Endpoint Protection suite works together with Norton Internet Security?

In my case, I want only protect my Windows 2003 server. The other computers are already protected.

 

Summarized, what must I buy to protect my Windows 2003 server?