PidTagOriginalDisplayName Canonical Property
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Contains the original display name for an entry copied from an address book to a personal address book or other writable address book.
PR_ORIGINAL_DISPLAY_NAME, PR_ORIGINAL_DISPLAY_NAME_A, PR_ORIGINAL_DISPLAY_NAME_W
These properties contain information about the original source of a copied entry.
For a nonread report, these properties contain a copy of the display name of the original message recipient for which the report is generated. When the original recipient is part of a distribution list, the display name of the distribution list is preserved for the report.
A client application can use these properties to prevent alteration or "spoofing" of entries, by giving an unaltered copy of the display name to compare.