Connect your Office 365 Exchange Online email account to your iOS device by following these steps:

  1. Install the Outlook for iOS app from the iOS App Store and then open it.
  2. If it's your first time using Outlook for iOS, enter your full email address, then tap Add Account. If not, open the Menu > tap Settings > Add Account >Add Email Account.
  3. If you're asked to select your email provider, select Office 365.
  4. Enter your email account password and tap Sign In. 

Your account should now be added. You may choose to Add Another Account if you wish.