Stored on the Server??
rather than Outlook PST files on PC!
If you use Outlook configured to use POP, then Outlook will store messages in PST files on PC.
If you are sensible, you will use IMAP, and the messages will be stored on the server.
Consider using Thunderbird or some other competent IMAP client, rather than Outlook (which is probably spreads more viruses the any other program).