Its depends on a few things:
What version and what mode of Outlook are you using, mode information only
applies to Outlook 98 and 2000 and can be found by clicking on Help > About
2nd line (will say Internet only or Corporate/Workgroup)
What sort of mail server is the school running, i.e. Exchange, POP3 or IMAP
What sort of accounts have you set up in your Outlook, i.e. Exchange, POP3
and/or IMAP