Setup Office 365 email with built-in iOS mail app:

IMPORTANT: Delete Your Old Email Account with the same Email Address from your Phone (If you are migrating from another Email System)

1. Click the Settings Button on the Home screen

2. Select the Mail, Contacts, and Calendars option

3. Select your old Exchange Account

4. Press the red Delete Account button.

5. If prompted to remove contacts from your account, click “Delete from my iPhone”

Add Office365 account to iPhone:

1. Tap Settings > Mail > Accounts
2. Tap Add Account, then select Exchange or Microsoft Exchange

2. Enter your full email address, for example, and your password (If Requested), and then tap Next. Change the Description to your email address or company name.

3. On the next screen, tap Sign In

Tap Sign In if using O365 or tap Configure Manually if you have your organization's server settings.

4. Enter your Account Password

Enter your O365 work or school account password.

5. If you see the following window, tap Accept

Tap Allow if prompted to give permission.

6. By default, Mail, Contacts, Calendar and Notes information are synchronized. Tap Save.

Account sync settings

7. If you're prompted to create a passcode, tap Continue and type a numeric passcode. If you're prompted and don't set up a passcode, you can't view this account on your device. You can also set up a passcode later in your settings.