Error in opening draft email saved with msg extension

Question

I am attempting to create a email and save it on local hard disc. The email is a file having msg extension. So that it can be opened with MS Outlook. Also I want it to be in DRAFT mode. Like we can create draft email with MS Outlook. This message will have multiple attachmets.
Thus when user opens this file, it will get opened with MS Outlook and user will be able to edit the message text, TO/CC list, attachments.
I am using MimeMessage.writeTo(Outstream) API to save the message to a file, say C:\test.msg
But if I double click test.msg in explorer to open it, it gives error:
Can't open file C:\test.msg. The file may not exist, you may not have permissions to open it, or it may be open in another program.
Is it possible to create draft Outlook email message with msg extension?
If yes, how?
My code:
               Properties props = new Properties();
               props.load(new FileInputStream("C:/email.settings.properties"));
               // create some properties and get the default Session
               Session session = Session.getDefaultInstance(props);
               session.setDebug(debug);
               // create a message
               msg = new MimeMessage(session);
               //Create message from saved email
               File savedFile = new File("C:/test.msg");
               // set the from and to address
               InternetAddress addressFrom = new InternetAddress(from);
               msg.setFrom(addressFrom);
               InternetAddress[] addressTo = null;
               addressTo = new InternetAddress[recipients.length];
               for (int i = 0; i < recipients.length; i++) {
                    addressTo[i] = new InternetAddress(recipients);
               msg.setRecipients(Message.RecipientType.TO, addressTo);
               // Setting the Subject and Content Type
               msg.setSubject(subject);
               msg.setContent(message, "text/plain");
               MimeBodyPart attachmentBodyPart = new MimeBodyPart();
               DataSource ds = new FileDataSource("C:/WhichSQLServer.pdf");
               attachmentBodyPart.setDataHandler(new DataHandler(ds));
               attachmentBodyPart.setFileName("WhichSQLServer.pdf");
               Multipart multipart = new MimeMultipart();
               multipart.addBodyPart(attachmentBodyPart);
               msg.setContent(multipart);
               //msg.setFlag(Flags.Flag.DRAFT, true);
               msg.getFlags().add(Flags.Flag.DRAFT);
               msg.setFileName("test.msg");
               msg.saveChanges();
               FileOutputStream os = new FileOutputStream("C:/test.msg");
               msg.writeTo(os);
               os.flush();
               os.close();

Answer 1

Outlook Msg files aren't as easy to write as you would believe. They are a propretary format that microsoft uses based on the DocFile format that Word and Excel uses.
If you did the MimeMessage.writeTo(out) and saved it to a .eml file Outlook Express will open it, but Outlook doesn't directly read this file type.
I've started on a library to allow the creation of Outlook msg files, right now it only allows you to set text, dates, long, and boolean values on the email message (which means you can set stuff like the recieved date/time, subject, body, to, from, etc), but it does not yet support attachments or extra recipents (CC, BCC, etc). I'll be updating the copy on my site as soon as I get the other stuff working (which isn't as easy as it sounds).
Priasoft has a library available that can do what you want however.
travis (at) overwrittenstack.com