PidTagDisplayTo Canonical Property
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Contains a list of the display names of the primary (To) message recipients, separated by semicolons (;).
PR_DISPLAY_TO, PR_DISPLAY_TO_A, PR_DISPLAY_TO_W
The message store computes these properties on message objects by using the IMessage::ModifyRecipients method. The message store also maintains these properties so that it always reflects the last saved state of a message. The value is synchronized at the time of every call to the IMAPIProp::SaveChanges method.
If a message has no primary recipients, the message store should respond to an IMAPIProp::GetProps call with a return value of S_OK and an empty string for PR_DISPLAY_TO.
Because of the possible need for localization, MAPI provides these guidelines for all recipient names:
All names should be able to be localized.
The semicolon should be the character that is used to separate names in the PR_DISPLAY_BCC (PidTagDisplayBcc), PR_DISPLAY_CC (PidTagDisplayCc), and PR_DISPLAY_TO properties. Semicolons are not permitted within recipient names in MAPI.
Clients should translate each semicolon encountered in the PR_DISPLAY_TO and related properties to a localized separator character before making the information visible in the user interface.
When forwarding messages, clients do not need to translate the separator characters on the primary recipient line.