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X.400 is a very well
defined messaging standard typically used for communications between
different locations within organizations or between two specific
organizations. For example, Microsoft Exchange Server can use X.400
to connect different sites. Some X.400 services are said to be
"military-grade" because of the security they offer. For
Outlook, Exchange and Windows Messaging, X.400 connections are made
via MAPI transport and storage providers, which means that none of
the services listed here are compatible with Outlook 98 or Outlook
2000 running in Internet Mail Only mode.
Telex is an older communications technology -- still very much in
use for international communications.
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