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Using product keys with Office - Office SupportCan I view my product key online?
If you bought Office 365 or Office Home & Student
Your product key isn't displayed online. If Office is prompting you for a product key, you can sign in using the Microsoft account that you used to buy and download Office.
If you bought Office Home & Business, Office Professional, and individual Office apps
Product keys for one-time purchases of Office Home & Business, Office Professional, and individual Office apps are available at the Microsoft account, Services & subscriptions page. However, you don't need a product key to reinstall or activate these products. If these products are prompting you for a product key, you can sign in using the Microsoft account that you used to buy and download Office.
If you still want to view your product key, here's how:
Go to the Microsoft account, Services & subscriptions page and sign in, if prompted.
Select View product key. Note that this product key won't match the product key shown on an Office product key card or in the Microsoft Store for the same purchase. This is normal.