When adding a Server 2003 or Windows XP machine to Veeam, the true number of cores is not detected properly. Instead Veeam Backup & Replication only detects the number of Sockets.
A virtual machine with Server 2003, having a configuration of 2 Sockets and 4 Cores, is added to Veeam Backup & Replication. On the summary page the following is shown.
Additionally the following can be found in the VeeamShell.log
Info [This server] Determining cpu info.
Info [This server] PhyCpu: 1, PhyCore: 2, LogCpu: 8.