As you prepare to transition to Exchange 2007, you'll find that there are several areas of design and implementation that require a different perspective from previous versions. Storage design is one of these areas; the architectural changes in Exchange 2007 mean that you'll need to approach your Exchange environment with a fresh eye to design the optimum Exchange infrastructure for your needs. The major changes in Exchange 2007 include Microsoft's move to a 64-bit architecture, new server roles, and changes to the way that the Extensible Storage Engine (ESE) stores and formats data. In this guide, I'll explore these changes and explain what impact they'll have on your Exchange 2007 storage planning and implementation.