Name: Your Name (What ever you want)
Email: Your username
Password: Your office365.com account password
Description:
Click Next Button
Hostname: outlook.office365.com
Username: Your username
Password: Your office365.com account password
Hostname: smtp.office365.com
Username: Your username
Password: Your office365.com account password
Click Save Button
Use SSL: Yes
Authentication: Password
Server Port: 993
Use SSL: Yes
Authentication: Password
Server Port: 587
You can login office365.com and Signup for office365.com new account on your iPhone from here.