Required Properties for All Messages

Applies to: Office 2010 | Outlook 2010 | Visual Studio

The following table describes properties that clients can expect to set or see supported on messages of all classes.

Property	Description
PR_CREATION_TIMEPidTagCreationTime Canonical Property (PidTagCreationTime)	Set by message store providers on outgoing messages.
PR_DISPLAY_BCC (PidTagDisplayBcc) PR_DISPLAY_CC (PidTagDisplayCc) PR_DISPLAY_TO (PidTagDisplayTo)	Set by message store providers on outgoing messages.
PR_ENTRYID (PidTagEntryId)	Set by message store providers on outgoing messages.
PR_LAST_MODIFICATION_TIME (PidTagLastModificationTime)	Set by message store providers on outgoing messages.
PR_MESSAGE_ATTACHMENTS (PidTagMessageAttachments)	Set by message store providers on outgoing messages.
PR_MESSAGE_CLASS (PidTagMessageClass)	Can be set by clients on outgoing messages; must be set by message store providers if not set by clients.
PR_MESSAGE_FLAGS (PidTagMessageFlags)	Set by clients on outgoing messages before they are saved and message store providers after they are saved.
PR_MESSAGE_RECIPIENTS (PidTagMessageRecipients)	Set by message store providers on outgoing messages.
PR_MESSAGE_SIZE (PidTagMessageSize)	Set by message store providers on outgoing messages.
PR_MESSAGE_CC_ME (PidTagMessageCcMe) PR_MESSAGE_RECIP_ME (PidTagMessageRecipientMe) PR_MESSAGE_TO_ME (PidTagMessageToMe)	Set by transport providers on incoming messages.
PR_NORMALIZED_SUBJECT (PidTagNormalizedSubject)	Set by message store providers on outgoing messages
PR_ORIGINATOR_AND_DL_EXPANSION_HISTORY (PidTagOriginatorAndDistributionListExpansionHistory) PR_ORIGINATOR_CERTIFICATE (PidTagOriginatorCertificate) PR_ORIGINATOR_DELIVERY_REPORT_REQUESTED (PidTagOriginatorDeliveryReportRequested) PR_ORIGINATOR_NON_DELIVERY_REPORT_REQUESTED (PidTagOriginatorNonDeliveryReportRequested) PR_ORIGINATOR_REQUESTED_ALTERNATE_RECIPIENT (PidTagOriginatorRequestedAlternateRecipient) PR_ORIGINATOR_RETURN_ADDRESS (PidTagOriginatorReturnAddress)	Set by transport providers on outgoing messages.
PR_PARENT_ENTRYID (PidTagParentEntryId) PR_PARENT_DISPLAY (PidTagParentDisplay)	Set by message store providers on outgoing messages.
PR_RCVD_REPRESENTING_ADDRTYPE (PidTagReceivedRepresentingAddressType) PR_RCVD_REPRESENTING_EMAIL_ADDRESS (PidTagReceivedRepresentingEmailAddress) PR_RCVD_REPRESENTING_ENTRYID (PidTagReceivedRepresentingEntryId) PR_RCVD_REPRESENTING_NAME (PidTagReceivedRepresentingName) PR_RCVD_REPRESENTING_SEARCH_KEY (PidTagReceivedRepresentingSearchKey)	Set by transport providers on incoming messages.
PR_RECEIVED_BY_ADDRTYPE (PidTagReceivedByAddressType) PR_RECEIVED_BY_EMAIL_ADDRESS (PidTagReceivedByEmailAddress) PR_RECEIVED_BY_ENTRYID (PidTagReceivedByEntryId) PR_RECEIVED_BY_NAME (PidTagReceivedByName) PR_RECEIVED_BY_SEARCH_KEY (PidTagReceivedBySearchKey)	Set by transport providers on incoming messages.
PR_RECIPIENT_TYPE (PidTagRecipientType)	Set by message store providers on incoming messages.
PR_RECORD_KEY (PidTagRecordKey)	Set by message store providers on outgoing messages.
PR_SEARCH_KEY (PidTagSearchKey)	Set by message store providers on outgoing messages.
PR_SENDER_ADDRTYPE (PidTagSenderAddressType) PR_SENDER_EMAIL_ADDRESS (PidTagSenderEmailAddress) PR_SENDER_ENTRYID (PidTagSenderEntryId) PR_SENDER_NAME (PidTagSenderName) PR_SENDER_SEARCH_KEY (PidTagSenderSearchKey)	Clients can set these properties on outgoing messages, but transport providers must set them.
PR_SENT_REPRESENTING_ADDRTYPE (PidTagSentRepresentingAddressType) PR_SENT_REPRESENTING_EMAIL_ADDRESS (PidTagSentRepresentingEmailAddress) PR_SENT_REPRESENTING_ENTRYID (PidTagSentRepresentingEntryId) PR_SENT_REPRESENTING_NAME (PidTagSentRepresentingName) PR_SENT_REPRESENTING_SEARCH_KEY (PidTagSentRepresentingSearchKey)	Clients can set these properties on outgoing messages, but transport providers must set them.
PR_STORE_ENTRYID (PidTagStoreEntryId) PR_STORE_RECORD_KEY (PidTagStoreRecordKey)	Set by message store providers on outgoing messages.