Some of the suggestions you got here might ? or might not ? help. Some schools have pretty standard mail setups, and others don?t. If yours was plain vanilla, you?d probably already be in, because your phone would have taken your email address and password and done the rest for you.
Typically, somewhere on a school?s website there are instructions for setting up an email account on a phone. (If not, contact your school?s IT tech support.) If there aren?t instructions for Windows phone, try following the instructions for iPhone or Android. You may need to know, for example, whether to use an Exchange server, imap, webmail, pop, or something else. Sometimes you?ll need to enter the server names for incoming and outgoing mail.
There?s a way to do it ? it?s just a matter of finding out the specific requirements at your school.