Fetch mails for offline usage vs. leight-weight filling of Message object

Question

Hello!
I'm working on a simple mail class having just a send and a fetch method. But I ran into problems with the latter, because I can't return the messages I fetch. The JavaMail documentation says "Folder implementations are expected to provide light-weight Message objects, which get filled on demand.", so obviously my code won't work out.
public static Message[] fetchMails()
   Message messages[] = folder.getMessages();
   folder.close(true);
   store.close();
   return messages;
Messages msg[] = MailAccount.fetchMails();
System.out.println(msg.getSubject()); // error: Folder is not open.So how can I return the messages as an object, which I can work on even if the connection to the server is already closed? Is there any high level solution for this or do I have to use message.writeTo() or create my own container class for email contents?
Tnx in advance!                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

Answer 1

Could you please give an example for your first advice? folder.getMessages() returns an array of Message objects, but the MimeMessage constructor only takes MimeMessage objects and some InputStreams. Do I have to cast the Message objects somehow?
I try to keep my code as simple as possible (it's just a litte demo appication), so I don't want to go for any third party products. But the MimeMessage thing sounds like a good idea, if it works.
Thanks for your reply so far.