Syncing Outlook with an iPhone 5S

Hello, I appear to have an issue with syncing my Outlook account to my mail app on my new iPhone 5s. I put in my password and it will keep saying it can not verify or that the password is incorrect, however, I am certain I am using the correct password as I have tested it by signing out of my Outlook account on my computer and resigning in. I would appreciate any assistance I can receive on this matter. Thank you.