import java.util.Date;
import net.rim.blackberry.api.mail.Address;
import net.rim.blackberry.api.mail.Folder;
import net.rim.blackberry.api.mail.Message;
import net.rim.blackberry.api.mail.Session;
import net.rim.blackberry.api.mail.Store;

Store store = Session.waitForDefaultSession.getStore();

Folder folder = Store.getFolder("SampleFolder");

Message[] msgs = folder.getMessages();

Message msg = msgs[0]; // Retrieve the first message
Address[] recipients = msg.getRecipients(Message.RecipientType.TO);
Date sent = msg.getSentDate();
Address from = msg.getFrom();
String subject = msg.getSubject();
Object o = msg.getContent();
// Verify that the message is not multipart
if ( o instanceof String ) 
{
   String body = (String)o;
}
//...