Java API เพื่อแสดงผล MSG เป็น FLATOPC

// load the MSG file to be converted
MailMessage message = MailMessage.load("sourceFile.msg"); 
// save MSG as a HTML 
message.save("HtmlOutput.html", SaveOptions.getDefaultHtml());
// load HTML with an instance of Document
Document document = new Document("HtmlOutput.html");
// call save method while passing SaveFormat.FLAT_OPC
document.save("output.flat_opc", SaveFormat.FLAT_OPC);