I had zero problems with email on my Iphone before installing Outlook 2007 AND setting up my email account. When I do get emails on my Iphone for my Frontier account, they disappear in a matter of minutes...very frustrating. I have gone into Outlook, tools, account settings, dbl clicked on email account, more settings, advanced and made sure the box for "Leave copy of meesage on server" was checked. I even unchecked the box that said delete after 14 days. I also went onto my Iphone 4s and selected "never" delet email messages in my account settings on the phone.
Any ideas?