Setting email on outlook 2007 actually similar with setting email on other outlook, but there is different setting on advance setting. But if you don't change any other setting you just can receive email, but can't sent email out. Go to Tool menu then open then choose Account Setting then will merge popup menu like this:
If you already set your email before then click change, then click more setting, then will merge new popup menu you must choose Advance tab like this:
On advance menu you must change out going sever (SMTP) into 587, then close.