Usually when u use outlook, it actually downloads the message from the
server and deletes it from there. You can opt not to delete it from the
server so as to enable you to access it from anywhere. This option is
available under Tools->email accounts-> Change->More settings->Advanced->
leave a copy on the server
Now you can access these mails from anywhere throught the webmail. You can
configure outlook also to view these messages. But make sure on every
computer select to leave a copy on the server.