Microsoft Account is an online Office Account that enables the users to store and manage the details related to the purchased or subscribed Office versions by the users, along with the Office Product Key. Apart from this, the users could utilize the Office Account for purchasing the new subscription of the Office Setup.
Without considering the method adopted to purchase the Office Setup on the device, the users need to create the Office Account or the Microsoft Account. To get the steps to create the Office Account, go to the support section of the link: office.com/setup. By using the Microsoft Account, the users may login to the server applications, included within the purchased Office Setup.
Source : https://office-setup-install.com/how-to-get-back-the-microsoft-account-if-it-has-been-compromised/