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PidTagDisplayBcc Canonical Property
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Contains an ASCII list of the display names of any blind carbon copy (BCC) message recipients, separated by semicolons (;).
PR_DISPLAY_BCC, PR_DISPLAY_BCC_A, PR_DISPLAY_BCC_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 blind carbon copy 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_BCC.
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, PR_DISPLAY_CC (PidTagDisplayCc), and PR_DISPLAY_TO (PidTagDisplayTo) properties. Semicolons are not permitted within recipient names in MAPI.
Clients should translate each semicolon encountered in this property to a localized separator character before making the property information visible in the user interface.
When forwarding messages, clients do not need to translate the separator characters on the blind carbon copy recipient line.