1.Go to settings .
2. Go to Accounts & Passwords .
3. Add Account
4. Enter IPhone passcode for "Settings".
5. Click on (Exchange).
6. Type full user name - ( email@example.com).
7. Type current email password .
8. Click next .
9. I having to setup email manually .
10. You should see your full email username - ( firstname.lastname@example.org).
11. Type server - ( outlook.office365.com).
12.. Domain - You don't need to fill the field out .
13. Type username again.
14. click on next.
15. You will see check marks .
16. Click save .
17. Go to Mail and your email will start updating.