Microsoft® Exchange Server 2003 Administrator's Companion

Chapter 16. Coexisting with Previous Versions of Exchange

• Coexisting with the Exchange 5.x Directory

• Working with Sites, Administrative Groups, and Routing Groups

• Handling Other Coexistence Issues

• Summary

Many of you who pick up this book are facing coexistence—that is, interoperability—with previous versions of Microsoft Exchange. You might be migrating from Microsoft Exchange Server 5.5 to Microsoft Exchange Server 2003, or upgrading from Exchange Server 2003. In either case, the upgrades or migrations will at some point take place over a period of time, and you will need to contend with coexistence issues.

To make the migration go more smoothly and enable a seamless coexistence with Exchange Server 5.x, Microsoft has created a couple of services—enhanced ...