- Open Outlook on your Mac.
- Go to Outlook > Settings > Accounts and choose +, then New Account. On first launch, the setup screen opens by itself.
- Enter your full email address and choose Continue.
- Sign in with your Microsoft 365 password and approve the sign-in on your phone if asked.
- Choose Done. Your mail, calendar and contacts start syncing.
On iPhone or iPad? Install Microsoft Outlook from the App Store and sign in with your email address. It's more reliable with Microsoft 365 than the built-in Mail app.