Set up an Outlook account on the iOS Mail app - Microsoft Support
https://support.microsoft.com/en-us/office/set-up-an-outlook-account-on-the-ios-mail-app-7e5b180f-bc8f-45cc-8da1-5cefc1e633d1
WebGo to your iPhone or iPad's Settings > scroll down and tap Accounts & Passwords > Add Account. Note: If you're on iOS 10, go to Mail > Accounts > Add Account. Select Exchange. Enter your Microsoft 365, Exchange, or Outlook email address and a description of your account. Tap Next.
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