My current engagement has a lot of red tape in terms of network teams and security teams, I must admit I have downloaded the Dynamics CRM Implementation Guide and Planning Guide several times over the last few years despite knowing it was available online. At any rate Tiaan van Niekerk 0f the CRM DE LA CREME Blog has summarized the items relating to CRM 4.0 System Requirements and Required Components.
For the most up-to-date information about system requirements and required components, see the Microsoft Dynamics CRM 4.0 Server Readme.
For more information, see:
Microsoft Dynamics CRM Server hardware requirements
Microsoft Dynamics CRM Server software requirements
Microsoft Dynamics CRM Connector for SQL Server Reporting Services
Microsoft Dynamics CRM E-mail Router software requirements
Microsoft Dynamics CRM for Outlook hardware requirements
Microsoft Dynamics CRM for Outlook software requirements
Microsoft Dynamics CRM Web client software requirements
Microsoft Dynamics CRM Data Migration Manager hardware requirements
Data Migration Manager software requirements
64-bit supported configurations
Language support
Currency support