How to re-read email from Gmail?

Question

Guys another question from me.
I have 2 account, Yahoo and Gmail. I access the 2 of them with a JavaMail application.
my question is:
1. Why Gmail's POP3 protocol can't retrieve my newest message, e.g the one with today's date. I've set it to download all message from the inbox, but from what i read, It download the latest messages only from the ones dated back to 2006. Here's my sample code:
Folder folder = reader.getFolder();
result = folder.getMessages();
//Read Through Email
System.out.println(result.length);
for(int i =result.length-1;i>=0;i--)
String subject = result.getSubject();
Date tgls = result[i].getSentDate();
System.out.println(subject+ " Send Date: " + tgls);
2. Why can't i Redownload an email from Gmail account? How to prevent it? is the FetchProfile class has anything to do with it? Yahoo can do it for sure without it. So i wonder, how to do it with Gmail (or others with the same POP3 behaviour)?
3. If i really need FetchProfile for Gmail, is Yahoo! (or other email provider) can use it too?
4. Can somebody explain to me what is the FetchProfile for?
Thanks in advance.
Edited by: hansip87 on May 12, 2008 8:55 PM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

Yeah I've checked it, changed it to the first option - "     Enable POP for all mail (even mail that's already been downloaded)"
And still it can't re-download the downloaded once.
Well I've got my reason for this, it's because my program does something like this:
1. Fetch the message
2. Take all the message except attachment, insert it into a new class called LightMessage that represent a structure like Messages but without Folder or Session pointer in it.
3. We as user review it.
4. If desired, we'll call the receiver again to search with MessageNumberTerm that was taken from the first Pop3 fetch to take the attachment.
But that was resulting in error i've posted, saying that the message array is empty though the message is still in the inbox.
Should I just download all the Message info and then just take the attachment from the downloaded ones? Thanks in advance.