Outlook Express

Is there any way to set up Outlook Express so that it does not erase messages from your mail server when you download them? I have a computer at home and away at school that I use to check email. It is problematic when I need to access an email at school and it is not there because I recieved it on my home computer. I know I used to be able to do it with Netscape, but I don’t see how to do it with Outlook. Thanks.