langchain/document_loaders/email.py/OutlookMessageLoader/load
class OutlookMessageLoader:    def load(self) -> List[Document]:
        """Load data into document objects."""
        import extract_msg

        msg = extract_msg.Message(self.file_path)
        return [
            Document(
                page_content=msg.body,
                metadata={
                    "subject": msg.subject,
                    "sender": msg.sender,
                    "date": msg.date,
                },
            )
        ]