Windows Server 2003 is Microsoft's server operating system. It was originally called 'Windows .NET Server' later changed to 'Windows .NET Server 2003' and finally changed to 'Windows Server 2003'. It was released on March 28 2003 and went on the market at the end of April of the same year. Compared with Windows 2000 many improvements have been made such as: improved Active Directory (for example classes can be deleted from the schema); improved Group Policy operation and management; improved disk management such as from Shadow Backup files in Copy (Volume Shadow Copy). Especially in improved scripts and command line tools it is an innovation for Microsoft: Bring a complete command shell into the next version of Windows\u0026mdash;\u0026mdash; part of it.
 There are multiple versions of Windows Server 2003 each suitable for different business needs:
Windows Server 2003 < br/>Windows Server 2003 Web Edition
Standard English name: Windows Server 2003 Web Edition
It is used to build and store Web applications web pages and XMLWeb Services. It mainly uses IIS6.0 Web server and provides rapid development and deployment of XMLWeb services and applications using ASP.NET technology. It supports dual processors with a minimum of 256MB of memory. It supports a maximum of 2GB of memory.
Windows Server 2003 Standard Edition
Standard English name: Windows Server 2003 Standard Edition
The sales target is small and medium-sized enterprises supporting file and printer sharing and providing security The Internet connection allows centralized application deployment. Supports 4 processors; supports a minimum of 256MB of memory and a maximum of 4GB of memory.
Windows Server 2003 Enterprise Edition
Standard English name: Windows Server 2003 Enterprise Edition
The main difference between Windows Server 2003 Enterprise Edition and Windows Server 2003 Standard Edition is : Windows Server 2003 Enterprise Edition supports high-performance servers and can cluster servers to handle larger loads. Reliability is achieved through these functions helping to ensure that the system is still available even in the event of a problem. Supports up to eight processors in a system or partition an eight-node cluster and up to 32GB of memory.
Windows Server 2003 Datacenter Edition
Standard English name: Windows 2003 Datacenter Edition
For large-scale enterprises that require the highest level of scalability availability and reliability Designed for enterprises or national institutions. It is the most powerful server operating system. Divided into 32-bit version and 64-bit version:
The 32-bit version supports 32 processors and supports 8-point clusters; the minimum requirement is 128MB of memory and the maximum supports 512GB of memory.
The 64-bit version supports both Itanium and Itanium2 processors supports 64 processors and supports 8-point clusters; supports a minimum of 1GB of memory and a maximum of 512GB of memory.
Edit this excellent Windows Server 2003 textbook
 Ping Han Editor-in-Chief Yang Yun. Network server construction configuration and management project training\u0026mdash;Windows Server Beijing: Tsinghua University Press ISBN: 978-7-302-23607-8 2010.09 Editor-in-chief by Yang Yun Ping Han and others. Windows Server 2003 networking technology and training (2nd edition) (First Prize of Shandong Province Excellent Textbook) Beijing : People’s Posts and Telecommunications Press ISBN: 978-7-115-24719-3 2012.05   Yang Yun edited by Ping Han. Windows Server 2003 network operating system Beijing: People’s Posts and Telecommunications Press ISBN: 978- 7-115-19278-3 2009.04 Ping Han Yang Yun etc. Windows Server 2003 Configuration Management Project Training Course (Excellent Textbook by the Ministry of Education Computer Education Commission) Beijing: China Water Resources and Hydropower Press ISBN:978-7-5084-6930-0 2009.11
Now Microsoft has released win2008. The advantages of win2003 have low hardware requirements and are relatively mature and stable compared to 2008 but the performance is better than Win2008 is a bit worse you can choose according to your needs.?Windows server 2003 and 2008 difference contact and selection guide