Activation Problems

Transfer Office Home & Student 2019 to a New Mac: Fix License Error

Steve KSteve K Oct 28, 2026 868 views

Question details

The user needs to transfer an existing Office Home & Student 2019 license to a new Mac but is blocked by an activation error.

How to Transfer Office Home & Student 2019 to a New Mac
Product
Microsoft Office Home & Student 2019
Device & OS
macOS
Scenario
Setting up a newly purchased Mac and attempting to reinstall previously purchased Office software after replacing an old computer.
Observed behavior
The installation process halts with an error message stating that the license is already in use on another device.
Before you start

Ensure you have the exact email address and password for the Microsoft account originally used to purchase and activate your Office Home & Student 2019 license.

Solution 1Recommended

Deactivate the Old License and Reinstall Office

Use your Microsoft account portal to unlink your old Mac, remove any conflicting trial software on your new Mac, and perform a fresh activation.

Office Home & Student 2019 is a single-device license. To use it on a new computer, you must first tell Microsoft's servers to release the activation from your previous Mac. Additionally, new Macs often come with a preinstalled Microsoft 365 trial that can cause activation conflicts with older standalone licenses.

1
Sign in to your Microsoft Account

Open a web browser and navigate to the Microsoft Account website. Log in using the credentials associated with your Office 2019 purchase.

2
Deactivate the old Mac

Go to the 'Services & subscriptions' section. Locate your Office Home & Student 2019 license, click on 'Installs', and select 'Sign out of Office' or 'Deactivate' next to your old Mac's device name.

3
Uninstall Microsoft 365 trials on the new Mac

On your new Mac, open 'Finder' and navigate to 'Applications'. If you see any preinstalled Microsoft 365 Family trial applications, drag them to the Trash and empty the Trash to prevent activation conflicts.

4
Download and install Office 2019

Return to the 'Services & subscriptions' page on your Microsoft account, click 'Install' next to your Office 2019 license, download the installer, and follow the on-screen prompts to set it up on your new Mac.

5
Activate the software

Launch Microsoft Word or Excel on your new Mac. When prompted, sign in with your Microsoft account to complete the activation process.

Deactivate the Old License and Reinstall Office
Remote Deactivation: You do not need physical access to your old Mac to deactivate the license. The deactivation process is handled entirely online through your Microsoft account portal.
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Frequently Asked Questions

Why does Office say my license is already in use?

Office Home & Student 2019 is a one-time purchase meant for a single device. If the license is still registered to your old Mac, Microsoft's activation servers will block the installation on your new Mac until the old device is properly unlinked.

Can I transfer my Office 2019 license if my old Mac is broken or traded in?

Yes. You do not need to turn on your old Mac to transfer the license. You can deactivate the old installation remotely by logging into your Microsoft account via any web browser and managing your devices under the 'Services & subscriptions' section.

What should I do if activation still fails after deactivating my old Mac?

First, ensure you have completely uninstalled any preinstalled Microsoft 365 trials from your new Mac's Applications folder, as these often intercept the activation. If the issue persists, double-check that you are using the exact Microsoft account used to redeem the original product key, or contact Microsoft Support for further assistance.