T
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template object
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See address template.
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tombstone
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An object with the Is-Deleted attribute set that remains in the Microsoft Exchange Server for a set period of time. See also Exporting and Importing Changed Objects.
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Transport-Neutral Encapsulation Format (TNEF)
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A standard method defined by MAPI of passing textual and binary message data. The method involves wrapping unsupported MAPI properties in a binary attachment file that accompanies a message through the transport and decoding the file on the receiving side to reconstitute the MAPI properties.