How to Install or Reinstall Microsoft Office

A Step-by-Step Guide to Install or Reinstall Office on Any Windows Device

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Microsoft Office is available to buy directly from Microsoft online or from big box stores and third-party retailers. After you make the purchase, download the software and install it. Here are the steps you'll follow to install Microsoft Office on any Windows laptop, computer, or tablet.

Locate the Download Page and Activation Key

After you purchase Microsoft Office, activate and download the product. Detailed instructions are included in the packaging if you buy the software at a retail store or order a key card online from someplace like Amazon. If you order directly from Microsoft, you'll get the link in an email. There’s an "Install Office" link on the receipt.

A picture of an order for Microsoft Office.

Or, visit and sign in with your Microsoft account to start the installation process.

You'll enter a product key (or activation code) before downloading the installation file. This product key lets Microsoft know the software was purchased legally. The key also comes with any physical packaging you receive and is included in an email if you ordered digitally. Write this activation code down and keep it in a safe place. You’ll use it if you need to reinstall Microsoft Office.

Find the Microsoft Office Installation File

Once you sign into your Microsoft account and locate your product key, visit to activate it, then select Install Office. If you purchased Office 365, sign in to your Microsoft account, go to the Office home page, select Install Office apps, then choose Office 365 apps to download the installation file.

A picture of the three required steps to installing Office.

Download and run the Microsoft Office Installation File

After the installation file is downloaded, what happens next depends on which web browser you use.

The easiest way to install Microsoft Office is to use the Edge browser. When you select Install, a dialog window at the bottom prompts you to either run the file, save it, or cancel. Select Run and work through the installation process.

A picture of the Install option for Microsoft Office.

If you use Chrome, for example, the file automatically goes to your Downloads folder and appears in the Download Manager at the bottom of the screen. Select the file to run it.

If the User Account Control asks whether you want to allow the app to make changes to your device, select Yes.

Install Microsoft Office

Once you run the downloaded file, the installation process begins automatically. If Windows asks if you want to allow the installation, select Yes. If it prompts you to close any open programs, select Yes.

A picture of Microsoft Office during the installation process.

The install is finished when you see the phrase, "You're all set! Office is installed now" and an animation plays to show you where to find Office applications on your computer. Select Close.

That’s it! Microsoft Office is now installed and ready to use. Note that you might be prompted to install updates to Office. If so, allow those updates to happen.

To reinstall Microsoft Office, go to My Account and select the download link if you don't already have the installation file on your hard drive. Then, follow the instructions outlined above. If you do have the file, run it to begin the installation process again.