Adding 365 Exchange Email to Iphone
Add your Exchange account
Tap Settings > Passwords & Accounts > Add Account > Exchange.
Enter your address
Enter your email address, then tap Next. You can also enter an account description.
Connect to your Exchange Server
After you enter your email address, choose Sign In or Configure Manually.
Tap Sign In to automatically discover your Exchange account information. If your account uses modern authentication, you’ll be guided through a custom authentication workflow.
Sync your content
You can sync Mail, Contacts, Calendars, Reminders, and Notes. When you’re finished, tap Save.