Supporting Messaging Clients

Front-End/Back-End Architecture

In previous versions of Exchange, Information Store managed the databases and client access protocols such as Internet Message Access Protocol version 4 (IMAP4), Post Office Protocol version 3 (POP3), Network News Transfer Protocol (NNTP), and MAPI. In Exchange 2000, the Internet access protocols have been removed from Information Store and are managed by IIS instead. Deploying a front-end/back-end architecture makes it possible to manage the Internet access protocols on a server that is separate from the one on which Information Store and the databases run. Essentially, a bank of protocol servers (front-end servers) handle incoming client connections while Information Store servers (back-end servers) are dedicated to running the databases.

Benefits of Front-End/Back-End Architecture

The main benefits of a front-end/back-end architecture are a unified namespace and reduced overhead for Secure Sockets Layer (SSL) encryption.