Server showing less that the 4GB of RAM installed?

All Windows 32-Bit Operating Systems are unable to address more than 3 - 3.5GB of RAM. The following operating systems are able to address more than 4GB of memory as indicated by Microsoft article 283037:
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Datacenter Server
  • Microsoft Windows Server 2003, Enterprise Edition
  • Microsoft Windows Server 2003, Datacenter Edition