You are the messaging engineer for your company.

The network contains two Microsoft Exchange Server 2003 servers named Server1 and Server2. Server1 is a back-end server. Server2 is a front-end server. You purchase a new server named Server3 that has the same hardware as Server1 and Server2.

All server hardware supports both the 32-bit and 64-bit versions of Microsoft Windows Server 2003.

You need to recommend a strategy to transition from Exchange Server 2003 to Exchange Server 2007.

Your strategy must meet the following requirements:

Minimize downtime.

Configure the solution to be supported by Microsoft for production environments.

Configure one server to provide Exchange Web Services and message delivery and a different server to manage Mailbox databases.

What should you recommend?