The OfficeScan client must
               be installed on:
            
            
               - 
                  Windows 7 
- 
                  Windows Server 2008 
- 
                  Windows Vista 
It cannot be installed on Windows Server 2003 and Windows XP
               because these operating systems only support IPv6 addressing partially.
            
            It is preferable for an OfficeScan client to
               have both IPv4 and IPv6 addresses as some of the entities to which
               it connects only support IPv4 addressing.