Microsoft has released 4 documents that provide descriptions and overviews of features, guidlines for planning and steps for deploying Exchange 2007 organisations for the following:
- A simple organisation: A single Exchange server that provides all Exchange services and stores all Exchange data for the entire organization OR multiple Exchange servers in a topology that includes redundant directory servers and an Edge Transport server in a perimeter network.
- A standard organisation: builds upon the simple Exchange organization by deploying multiple computers running Exchange.
- A large organisation: the large Exchange organization is the largest organization model that can be deployed in a single Active Directory directory service forest environment.
- A complex organisation: includes multiple Active Directory directory service forests or the use of synchronization technology.
You should also check out:
- Planning Your Deployment: A set of checklists and best practices.
- The Exchange Server 2007 Library: A complete set of documentation.