It is just a result of poor planning, technically they are two separate accounts. https://blogs.technet.microsoft.com/enterprisemobility/2016/09/15/cleaning-up

It is just a result of poor planning, technically they are two separate accounts. https://blogs.technet.microsoft.com/enterprisemobility/2016/09/15/cleaning-up-the-azure-ad-and-microsoft-account-overlap/ https://blogs.technet.microsoft.com/enterprisemobility/2016/... They did add an option so you can change your personal account's email address so you don't have to deal with account namespace issues.