Published: July 16, 2012
Deletes one or more properties from an object.
You do not have to set the property type for each property tag in the property tag array pointed to by the lpPropTagArray parameter. Property types are ignored; only the property identifiers are used.
Be aware that some objects do not allow modification and that these objects return MAPI_E_NO_ACCESS from the DeleteProps method. Other objects allow some properties to be deleted, but not others. When there is a problem deleting only some of the properties, DeleteProps returns S_OK. If you have passed a valid pointer in the lppProblems parameter, DeleteProps will set the pointer to an SPropProblemArray structure that contains detailed information about the problems with each property. For example, if you are deleting all of the properties of a message and there is a problem with one or more of its attachments, the SPropProblemArray structure will contain an entry for the PR_MESSAGE_ATTACHMENTS (PidTagMessageAttachments) property.
The structure pointed to by lppProblems is only valid if DeleteProps returns S_OK. If DeleteProps returns an error, do not attempt to use the SPropProblemArray structure. Instead, call the object's IMAPIProp::GetLastError method to obtain more information about the error.
Free the returned SPropProblemArray structure by calling the MAPIFreeBuffer function.