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  2. To use Microsoft 365 on your new device, you can activate Microsoft 365 as a 1-month trial of Microsoft 365 Family. You can also buy Microsoft 365 or a non-subscription version of Office, add Microsoft 365 to an existing Microsoft 365 subscription, or enter a product key from a new product key card.

  3. If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product. After you enter your key, you can download and install Office, or you can renew your Microsoft 365 subscription.

  4. If you try to install and activate these versions of Office on a different computer (owned by you or someone else), or on the same computer after a hardware change, you might see an error message that says you've reached the maximum number of activations.

    • Using Microsoft Account: Open Start ('Start' icon). It's the button with the Windows logo in the lower-left corner of the taskbar. Click an Office product.
    • Using Product Key on an Office App: Click an Office product. Click a product such as Word or Excel to launch the program. If you own a product key but don't have Microsoft Office installed on your computer, you'll have to use the Office website.
    • Using Product Key on the Office Website: Go to https://setup.office.com/ in a web browser. This website will let you activate and download Microsoft Office.
  5. If Office is prompting you for a product key, and you want to buy a product key to activate Office, it's better to uninstall your current version of Office and then buy and install a new version of Office from the Microsoft Store. This way you can be sure that Office will activate successfully.

  6. Office might activate automatically. However, depending on your product you might see the Microsoft Office Activation Wizard. If so, follow the prompts to activate Microsoft 365 . If you need activation help, see Activate Office.

  7. Use your Microsoft account, not your product key, to install and activate Microsoft 365 and individually purchased Microsoft 365 Apps, such as Project, Visio, Word, Excel, or Outlook. For more information, see Office is prompting me for a product key. If your purchase of Office came with a product key, see Where to enter your Office product key.