How do I get an office 365 email account set up on IOS 8.1.3?

I'm struggling to get an Office 365 email account set up natively via Exchange or Outlook.com on my iPhone 5S with iOS 8.1.3.

Is this a known problem?

I can download the Outlook app and get it to work, but I'd rather have it set up via the IOS mail app if possible.

Any help would be appreciated.

Thanks.