Microsoft Exchange Account On an iPhone 5

I feel pretty stupid about this. I have an Iphone 5 with the newest software. I have a school email account that is Microsoft Exchange. I use my MacBookPro at school to check the Exchange account just fine using wireless that is provided here at school; not a physical ethernet connection.

I cannot get my Iphone to connect to the Exchange email. I have looked at the settings in my laptop Mail account and it all seems like pretty conventional settings, but it just won't connect. It says it cannot find the server, which is "mail.polo222.org".

I don't have much recourse to any IT help, as our IT man is rabidly anti-mac and is a physics teacher turned IT guy and I don't think is always up to speed on the latest networking (even though he is far more along than I am).

Any help would be greatly appreciated.

Brian

For what it is worth, I have a comcast account and an AOL account that work just fine on the Iphone. I don't really undestand the differences in IMAP and POP terms, but I believe Exchange is something different from either one of them. I didn't make those choices when trying to set up the account; I just chose "Exchange" when first given the choice.