This is a very cool download from Microsoft: Exchange Server 2007 Proof of Concept (POC) in a Box.
Brief Description
Use this kit to drive your sales cycle to completion by demonstrating Exchange Server 2007 capabilities on your customers’ existing network infrastructure.
Overview
Deploy and use the Exchange Server 2007 Proof of Concept (POC) in a Box in the following phases: Phase 1: Sets up the POC Environment Phase 2: Customer Evaluates the Scenarios Phase 3: Partner Responds to the Customer.