I noticed that if I delete the e-mails from my iPhone and then I access my e-mail through my lap top, the mails that I deleted are still on my Inbox which means that when I deleted them from my iPhone have not been deleted from the Server. Also if I re setup my e-mail account on my iPhone, all the e-mail that have been deleted from my iPhone will be uploaded again! I have noticed this is Live Account and my Carrier Account but not in Gmail and Yahoo.