Allthough it’s out there for quite some time, but very useful information for companies considering migration.
Microsoft TechNet: Exchange Server 2003 Interoperability and Migration Guide: “The Exchange Server 2003 Interoperation and Migration Guide was created to help messaging administrators and consultants to connect and migrate non Exchange Server messaging systems to Exchange Server 2003. It describes the process by which you design an efficient Exchange Server 2003 interoperability and migration strategy. It includes prerequisites and actual procedures for connecting Exchange Server 2003 to common non Exchange Server messaging platforms, including, but not limited to, Lotus Notes (and Lotus Domino) and Novell GroupWise. Connector components including Exchange Connector for Lotus Notes, Exchange Connector for Novell GroupWise, Calendar Connector, and general connectors based on SMTP and X.400 are described. The Exchange Server Migration Wizard, the fundamental tool for migrating user data, is discussed at length. There is also a troubleshooting chapter to consult if you encounter issues with interoperability and migration.”
