Clustering support in Exchange Enterprise keeps your server up and running in the event of a hardware failure so that your business can stay online. The transaction-based store of Exchange Server and MTAs makes sure that message delivery is reliable. You can always determine if your e-mail reached its destination and whether it was read. Openness and interoperability Multiprotocol architecture. Built-in Internet standards.
Native implementation means high-fidelity message delivery across a variety of clients.
Shared file systems interoperability. Exchange delivers integrated X.400, X.500, and X.25. Scalable, compatible client family. Tight integration with the Windows NT directory and common performance monitoring and administration tools simplify Exchange management and reduce total cost of ownership. Exchange 5.5 delivers advance support of the Active Directory Service Interface to be delivered in Windows NT 5.0.