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Internal communications between Exchange Servers (2000 and later) over SMTP encode the message in S/TNEF (Summary TNEF) format.
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Other TNEF files may contain files which have been attached to an e-mail message. Some TNEF files contain information used only by Outlook to generate a richly formatted view of the message, such as embedded ( OLE) documents or Outlook-specific features such as forms, voting buttons, and meeting requests.