This is a very useful set up page here.
How To Get Exchange ActiveSync Working With Hotmail On iPhone
To get Exchange ActiveSync working on your iDevice, follow along with the steps below:
1.) On your iDevice, go to Settings > Mail, Contacts, Calendars > Add Account.
2.) Tap on Microsoft Exchange.
3.) Input the following information:
Email: Your Hotmail address (firstname.lastname@example.org)
Domain: Leave it blank
Username: Your Hotmail address (email@example.com)
Password: Your Hotmail password
Tap on Next. Once the account is verified, a new “Server” field will appear. When it does, input the following:
4.) Now enable push for either Mail, Contacts, or Calendar or all three.