Using a Microsoft account and linking it with your Office for home product connects you to various Microsoft products and services, and makes it simple to reinstall Office without a product key.
Note: Linking a Microsoft account with Office only applies to Microsoft 365 Family or Personal, or non-subscription versions of Office Home and Student, Office Home and Business, Office Professional and some versions of Office Professional Plus (2013 or newer).
A few things to keep in mind:
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A Microsoft account is required to install and activate Office versions 2013 or later, and Microsoft 365 for home products.
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You might already have a Microsoft account if you use a service like Outlook.com, OneDrive, Xbox Live, or Skype; or if you purchased Office from the online Microsoft Store.
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If you don't have a Microsoft account yet, you’ll be asked to create one the first time you install or activate your copy of Office.
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When you link your Microsoft account to Office, it means anytime you want to install or reinstall Office you won't need to re-enter your product key, or hang on to an installation disc or thumb drive.
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If you use Microsoft 365, you can add your credit card information to your Microsoft account and turn on recurring billing so Office is always available.
