Microsoft Exchange Server

Definition of Microsoft Exchange Server in The Network Encyclopedia.

What is Microsoft Exchange Server?

Microsoft’s client/server messaging system for Windows NT and Windows 2000. Exchange Server 5.5 supports all key industry messaging standards, including the following:

  • X.400
  • Internet standards (SMTP, POP3, IMAP4, LDAP, HTTP, NNTP, SSL, MIME, and S/MIME)
  • Messaging Application Programming Interface (MAPI)

Exchange clients are available for all the popular operating systems, including the following:

  • MS-DOS, Windows 3.x , Windows 95, Windows 98, Windows NT, and Windows 2000
  • Apple Macintosh
  • UNIX
  • OS/2

The popular client Microsoft Outlook complements Exchange Server by providing users with a full desktop information-management tool for managing messages, appointments, tasks, and contacts.

Exchange Server is designed for mission-critical enterprise-level messaging solutions and includes such features as

  • Intelligent message rerouting
  • Transaction-based directory services
  • Fault-tolerant message store
  • Built-in server and link monitoring tools
  • Connectors and gateways for connectivity with foreign mail systems

Exchange Server can coexist with most popular mail systems and can be used for messaging connectivity with the following:

  • Microsoft Mail
  • Internet mail (SMTP)
  • X.400
  • Lotus cc:Mail
  • IBM PROFS and SNADS

How It Works

A company’s Exchange organization is divided into sites, each of which has one or more Exchange servers. Site connectors provide connectivity between permanently connected sites, and you can use other connectors to establish messaging connectivity with foreign mail systems and over dial-up Remote Access Service (RAS) connections. Exchange Server offers public folders for document sharing and management, and address book views provide users with custom lists of recipients. An entire Exchange organization can be managed from a single workstation running the Exchange Administrator program. Clients can access their mailboxes from standard clients such as Outlook or standard Web browsers such as Microsoft Internet Explorer using the Outlook Web Access feature.

The core components of Exchange Server and other messaging components are implemented as Windows NT services. The four core components of Exchange Server are as follows:

  • Exchange directory service
  • Exchange Message Transfer Agent service
  • Exchange Information Store service
  • Exchange System Attendant service
NOTE

Exchange Server 4 natively supported the SMTP, MIME, MAPI, X.400, and X.500 messaging standards. Exchange Server 5.0 supported additional Internet standards such as POP3 for mailbox access, SMTP for Internet mail, NNTP for Usenet newsgroups, LDAP for X.500 directory access, HTTP and HTML for Web browser access, and SSL for secure authentication and encryption. Exchange Server 5.5 has added support for Microsoft Cluster Server, IMAP4, S/MIME, Key Management, Virtual Organizations, and unlimited message store size.

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