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This article provides step-by-step instructions on how to activate Office for Mac. If you're running into errors or issues with installing or activating Office on your Mac, see What to try if you can't install or activate Office for Mac instead.

Before activating and if you haven't already, you'll need to redeem and install Office on your PC or Mac.



In the top menu bar select Finder > Applications and scroll down to the Microsoft Office apps.

Open any Office app, like Microsoft Word and in the What's New box that opens, select Get Started.

Start activating Word 2016 for Mac

On the Sign in to activate Office screen, select Sign in.

Note: If you weren't prompted to sign in, open a blank file and go to File >New from template > Sign in.

Select Sign In to activate Office for Mac

Enter the email address associated with Microsoft 365 for Mac and click Next.

Note: This may be the email you used for your Microsoft account or the Microsoft 365 for business account assigned to you by your work or school.

Enter the email address associated with Office.

Step 4
Enter the password associated with the email address you entered, and click Sign in.

Note: This screen may look different depending on your email provider.

Enter your password

Step 5
The system checks if you have a valid license and then will activate the product.

Important: If you have multiple licenses, please follow the steps in the Activate with multiple licenses section.

Please wait while Office for Mac tries to activate

Step 6
You're done! Click Start Using Word, to start using the app.

Tip: To make the Office apps easy to launch, you can add them to the dock.

Start using Word 2016 for Mac

Common questions

For Microsoft 365 for Mac, you can have up to 25 licenses associated with the same Microsoft account: only one license for a Microsoft 365 subscription and multiple one-time-use installs of Microsoft 365 for Mac Home and Student or Home and Business.

If you have multiple Mac licenses associated with the same Microsoft account, it's best to start with a Microsoft 365 subscription because you can install on all your devices and be signed in to Office on five devices at a time. A one-time-use license can not be deactivated. If you don’t have a Microsoft 365 subscription, start by using the license at the top of the list and moving your way down.

There isn't a way to track your one-time licenses so we recommend you keep a list as to which license is activated on which device. If you don’t remember which license was used, you'll have to go through a process of elimination to determine which ones you've used so far.

  • Choose the license you want to use. (We highly recommend choosing a Microsoft 365 license if you have one.)

  • After the license validates, it will activate the product, and you can click Start Using Word to open and start using Microsoft 365 for Mac.

Choose Office 2016 for Mac license type

If you try to activate a one-time install of Microsoft 365 for Mac and you get the error: Key already used, you will need to select another license to use. Click Cancel and you'll return to the license selection screen.

The license that you tried to use will be grayed out. You can select any other license that hasn't been used.

"Key already used" message when activating Office 2016 for Mac

If you haven't redeemed your product key for Microsoft 365 for Mac, you'll want to do that before trying to activate. Follow these steps:

Step 1: Go to

Step 2: Sign in with your Microsoft account, or create one if you don't have one (you can create one with any existing email address you already have). Be sure to remember this account so that you can install or reinstall Office later, without a product key.

Step 3: Enter your Office product key, without hyphens.

Step 4: Follow the prompts to finish the redemption process.

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