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Download and install or reinstall Microsoft 365 or Office 2021 on a PC or Mac



Before you begin, make sure your PC or Mac meets the system requirements.

If you are reinstalling Office, you have already redeemed a product key, or you are installing Office at work or school and know you have a license, then go to the section sign in to download and install Office.

However, if this is the first time you’re installing Office, you may have some pre-installation steps to do first. Expand the Learn more section below for more info.

Learn more about product keys, assigned licenses, HUP, and volume license versions
Sign in to download and install Office
Install on a PCInstall on a MacNeed help?
Sign in to download Office
Go to and if you’re not already signed in, select Sign in.

Note: If you’re using Microsoft 365 operated by 21 Vianet, sign in with your work or school account to

If you’re using Microsoft 365 Germany, sign in with your work or school account to

Sign in with the account you associated with this version of Office. This account can be a Microsoft account, or work or school account. I forgot the account I use with Office

After signing in, follow the steps that match the type of account you signed in with.

You signed in with a Microsoft account

From the Office home page select Install Office.

Screenshot of home page after signing in
Select Install (or depending on your version, Install Office>).

You signed in with a work or school account

From the home page select Install Office (If you set a different start page, go to


For Microsoft 365 operated by 21 Vianet go to

For Microsoft 365 Germany go to

Screenshot of if signing in with a work or school account
Select Office 365 apps to begin the installation.

The 64-bit version is installed by default unless Office detects you already have a 32-bit version of Office (or a stand-alone Office app such as Project or Visio) installed. In this case, the 32-bit version of Office will be installed instead.

To change from a 32-bit version to a 64-bit version or vice versa, you need to uninstallOffice first (including any stand-alone Office apps you have such as Project of Visio). Once the uninstall is complete, sign in again to and select Other install options, choose the language and version you want (64 or 32-bit), and then select Install. (See Install Visio or Install Project if you need to reinstall those stand-alone apps.)


For Microsoft 365 operated by 21 Vianet go to

For Microsoft 365 Germany go to

This completes the download of Office to your device. To complete the installation, follow the prompts in the “Install Office” section below.

Tip: Don’t see an install option after signing in? There could be an issue with your account. Select Need help? from above and review the solutions under Account questions.

Install Office
Depending on your browser, select Run (in Microsoft Edge or Internet Explorer), Setup (in Chrome), or Save File (in Firefox).

If you see the User Account Control prompt that says, Do you want to allow this app to make changes to your device? select Yes.

The install begins.

Shows the progress dialog box that appears when Office is installing

Your 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.

Office is installed now. Select Close

Installation or sign in issues?
Tip: You can download and install the Microsoft Support and Recovery Assistant to help with Microsoft 365 installation issues on a PC. For more information, see About the Microsoft Support and Recovery Assistant.

If you’re having an installation issue such as Office taking long to install, try Need help? for a list of common issues.

Activate Office
To open an Office app, select the Start button (lower-left corner of your screen) and type the name of an Office app, like Word.

If you have Windows 8.1 or 8.0, type the name of an Office app on the Start screen. Can’t find your Office apps?

To open the Office app, select its icon in the search results.

When the Office app opens, accept the license agreement. Office is activated and ready to use.


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