If you are using a Mac, you would either be using Apple/Mac Mail as your mail program (default), or Microsoft Outlook for Mac.
Mac Mail
If you are using Mac Mail as your mail program, please follow this guide on Microsoft's website to set up your Office 365 email address/es. You will need to follow Steps 1 to 5 under "Set up Exchange account access using Mac OS X 10.10 or later".
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Microsoft Outlook
If you are using Outlook for Mac, please follow this guide on Microsoft's website to set up your Office 365 email address/es. You will need to follow Steps 1 to 7 under "Add a new account quickly".
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