For Mac email application:
Set up email in Mac OS X Mail - Outlook for Mac (microsoft.com)

For Outlook on Mac:
Add an email account to Outlook - Office Support (microsoft.com)

For Outlook on PC:
Add an email account to Outlook - Office Support (microsoft.com)

For Outlook on Android:
Set up email in the Outlook for Android app - Office Support (microsoft.com)

For Outlook on iPhone:
Set up an Outlook account in the iOS Mail app - Office Support (microsoft.com)

For adding Outlook to the iOS Mail App:
Set up an Outlook account on the iOS Mail app - Office Support (microsoft.com)