Retrieves information about messages specified by the MessageSet property.
This method retrieves information for the messages specified by the MessageSet property. This includes information about the message envelope as well as message structure. Every time a message envelope is retrieved, a MessageInfo event is fired, and message envelope information is stored in properties such as: MessageSubject, MessageFrom, MessageRecipients, etc. If the message is a multipart message, one or more MessagePart events are fired before the MessageInfo event - one for each message part.
This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)