ONE Unified Mac Xperience
Open Outlook and select Tools menu then Accounts. If this is the first account you’re creating in Outlook, under Add an Account select Exchange Account. Or if you have previously created an account for a different email address, in the lower-left of the Accounts box, click + and Exchange
ONE Unified Sign-in Xperience
First you need a domain to register with Microsoft 365 Business / Enterprise
*Once your domain has been setup, you can now proceed with the steps to Sync your devices however there is sometimes a waiting period. When updating a domain the records at your domain provider may take time to update, this can take anywhere from a few minutes to 48-hours, depends on your domain registrar.