Select Exchange
Enter your Office 365 email address, password, and a description of your account. Then tap Next.If you're prompted to enter server settings, enter the following and tap Next.
Email: your full email address.
Server: outlook.office365.com.
Username: your full email address.
Password: email account password.
NOTE: Double-check that everything is spelled correctly.
Your email account is now ready for use with the iOS Mail app!