What is the difference between versions of Windows Server 2008

WIN 2008 various versions
   

What is the difference between versions of Windows Server 2008

 (Standard Edition) 
 Features: 
 for SMBs, supporting Windows Server 2008 features in the environment is the longest deployed version, unlike other versions a, 32-bit editions support up to 4GB of memory , supports up to 4 CPU B, 64-bit versions with up to 32GB of memory in SMP configurations, supports up to 4 CPU C in SMP configurations, supports Network Load Balancing clusters, but does not support failover clustering 
 
 Windows Server Enterprise Edition (Enterprise Edition) 
 Features: 
 for large enterprises, on servers running SQL Server Enterprise Edition and Exchang Server 2007 applications, use this version a, failover cluster B, ad Authentication C, 32-bit version supports up to 64GB of memory, supports up to 8 CPU D, 64-bit versions in SMP configuration up to 2TB memory, supports up to 8 CPUs in SMP configuration 
 
 Windows Server Datacenter Edition (Datacenter Edition) 
 Features: 
 for large-scale enterprise A, 32-bit version supports up to 64GB of memory, in SMP configuration up to 32 CP B, 64-bit version supports up to 2TB of memory, in SMP configuration up to 64 CPU C, Supports failover clustering and ADFS D, unrestricted virtual image access 
 
 Windows Web Server (Web application Server) 
 Features: 
 is a, 32-bit version designed specifically for WEB application servers with up to 4G support b memory, supports up to 4 CPU B, 64-bit versions in SMP configuration up to 4GB memory, supports up to 4 CPU C under SMP configuration, supports Network Load Balancing cluster 
 
 Windows server Croe (Server Core) 
 Features: The 
 Server Core is a lite version of one of the steps in Windows Server 2008 above. No desktop, like Linux or DOS command line managed by commands, no interface for the 
 
 Windows Server for ltanium-based Systems (Itanium) 
 Features: 
 for the Itanium processor system, This system is not commonly used by people. 

What is the difference between versions of Windows Server 2008