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Obtains the status associated with a message in a particular folder (for example, whether that message is marked for deletion).
The IMAPIFolder::GetMessageStatus method returns the status of a message. Message status is stored in the message's PR_MSG_STATUS (PidTagMessageStatus) property.
How the message status bits are set, cleared, and used depends completely on your implementation, except that bits 0 through 15 are reserved and must be zero. If you store messages in the IPM subtree, MAPI reserves bits 16 through 31 for use by IPM clients. If you store messages in other subtrees, you can use bits 16 through 31 for your own purposes.
For MFCMAPI sample code, see the following table.
MFCMAPI uses the IMAPIFolder::GetMessageStatus method to get the status of the next message to be displayed.
OpenMessageNonModal and OpenMessageModal
MFCMAPI uses the IMAPIFolder::GetMessageStatus method to get the status of the message to be displayed to pass to the form viewer, which is either CMyMAPIFormViewer or IMAPISession::ShowForm.