In addition to the content listed above, you can use other technical content in "Planning and Architecture" to design the ideal Exchange solution to meet your business needs. You can also use this information to plan for the use of specific features, such as compliance, address rewriting, anti-spam antivirus features, and more. For more details, see the following topics:

• Planning Your Deployment
  
• Planning Your Server and Storage Architecture
  
• Planning for Compliance
  
• Planning Active Directory
  
• Planning to Use Active Directory Sites for Routing Mail
  
• Planning for Anti-Spam and Antivirus Features
  
• Planning for Domain Security
  
• Permission Considerations
  
• Planning for Address Rewriting
  
• Best Practices for Deploying a New Exchange Organization
  
• Best Practices for Transitioning an Exchange Organization
  
• Best Practices for Migrating from Lotus Notes to an Exchange Organization
  

Exchange 2007 introduces several architectural changes from previous versions of Exchange Server. Many features and components have been redesigned, some features have been removed, and several new features have been added.

The following topics discuss Exchange 2007 architecture from an IT professional perspective:

• Exchange Server 2007: Platforms, Editions, and Versions
  
• Server Roles
  
• Transport Architecture
  
• Message Routing in a Coexistence Environment
  
• Management Interfaces
  
• Topologies
  

Architectural information for developers is in the Microsoft Exchange Server 2007 SDK Documentation.

For more information and guidance on planning a highly available and reliable messaging infrastructure based on Exchange 2007, see the following topics:

• Deployment
  
• Operations
  
• Security and Protection
  
• Technical Reference
  
• Disaster Recovery
  
• High Availability