Windows Server 2003 (sometimes referred to as Win2K3) is a server operating system produced by Microsoft, released on April 24, 2003. An updated version, Windows Server 2003 R2, was released to manufacturing on December 6, 2005. Its successor, Windows Server 2008, was released on February 4, 2008. It is based on Windows XP, basically becoming an enhanced version of XP. According to Microsoft, Windows Server 2003 is more scalable and delivers better performance than its predecessor, Windows 2000.
Microsoft Windows Server 2003 Standard is aimed towards small to medium sized businesses. Standard Edition supports file and printer sharing, offers secure Internet connectivity, and allows centralized desktop application deployment. A specialized version for the x64 architecture (AMD64 and EM64T, called collectively x64 by Microsoft) was released in April 2005. The IA-32 version supports up to 4 physical processors and up to 4 GB RAM; the x64 version is capable of addressing up to 32 GB of RAM and also supports Non-Uniform Memory Access.