Configure iPhone/iPad for Office 365.
1. Open 'Settings'.
2. Select 'Mail, Contacts, Calendars', and then select 'Add Account'.
3. Select 'Exchange'.
4. Enter your email address and password. Enter a meaningful description for your account so that it is easily identifiable. Click 'Next' and the account will automatically set up.
5. You will be directed to the enabled account applications page. Choose the applications you would like enabled. Note: It may be undesirable to sync contacts as well, particularly for personal devices.
6. When done, tap 'Save'. If it is successful, you will see a tick next to each item.
If for some reason the above steps do not allow you to connect automatically, you may be prompted for the server address. Please input outlook.office365.com for the server, as shown below (your email address is also your username).