Product Key Issues

Fix Office 2016 Key Already Used Error on a New Mac

Ayan Masood Oct 22, 2026 868 views

Question details

The user needs to activate Office 2016 Home and Business on a new Mac but receives an activation error stating the key is already in use.

How to Fix the Office 2016 Key Already Used Error on a New Mac

Product: Office 2016 Home and Business
Device & OS: Mac
Scenario: Transferring an existing software license from an old MacBook Pro to a new Mac.
Observed behavior: The system displays an error message stating that the product key has already been used or has reached its reactivation limit.

Before you start

Ensure you have access to your original Office 2016 product key and the Microsoft account credentials associated with your initial purchase.

Solution 1Recommended

Contact Microsoft Support to Transfer the License

Since Office 2016 is a one-time purchase licensed for a single device, you must contact Microsoft Support to deactivate the old installation and authorize activation on the new Mac.

Microsoft Office 2016 does not support concurrent active installations across multiple devices under a single-user license. Moving to a new machine triggers the reactivation limit security protocol.

Sign in to your Microsoft Account

Go to the Microsoft account portal online and sign in with the email address linked to your Office 2016 purchase.

Verify your subscription

Navigate to the 'Services & subscriptions' section to confirm your Office 2016 Home and Business license is listed.

Open the Support page

Visit the Microsoft Support Contact page, choose 'Office' or 'Microsoft 365', and select 'Activation and Product Key' as your issue.

Request a license transfer

Initiate a live chat or callback and explain to the agent that you are moving your software to a new Mac and need the old activation record released.

Contact Microsoft Support to Transfer the License

Regional Support Variation: If you originally purchased your license in one region (like the United Kingdom) but are currently requesting support from another (such as India), mention this to the agent to ensure you are routed to the correct regional support team.

Solution 2

Uninstall Office 2016 from the Old Mac

Removing the software from your old MacBook Pro ensures compliance with the single-device license agreement and prevents conflicting activation pings.

Free Microsoft Office alternative

Try WPS Office for Mac Without License Transfer Hassles

Avoid the frustration of strict single-device activation limits and complicated support calls. WPS Office is a highly compatible, lightweight, and free alternative to Microsoft Office that works seamlessly on your new Mac.

1. Download the installer: Visit the official WPS website and download the Mac version of WPS Office.
2. Install the application: Open the downloaded file and drag the WPS Office icon into your Applications folder.
3. Start editing: Launch WPS Office, sign in to a free account, and immediately open or edit your existing Microsoft Office files.

No strict single-device activation limits for basic editing features.Fully compatible with Microsoft Office formats including .docx, .xlsx, and .pptx.Lightweight installation optimized for modern Apple Silicon and Intel Macs.Familiar tabbed user interface, ensuring a smooth transition without a steep learning curve.

microsoft office alternative - wps office

Frequently Asked Questions

Can I use Office 2016 Home and Business on multiple Macs simultaneously?

No, Office 2016 is a one-time purchase license intended for use on a single computer at a time. To use it on a new Mac, it must be deactivated on the old one.

Is there a way to manually deactivate Office 2016 online?

Unlike modern Microsoft 365 subscriptions, one-time purchases like Office 2016 generally cannot be manually deactivated via the Microsoft account dashboard. You typically need to contact Microsoft Support to perform the transfer.

What does the activation limit reached error mean?

This error indicates that the product key has been used to activate the software the maximum number of times allowed by the software license terms, which for Office 2016 is one active device.

Will uninstalling Office from the old Mac automatically free up my license?

Uninstalling removes the software locally but does not automatically ping Microsoft's servers to release the key. Contacting support is the most reliable way to reset the activation limit.

Installation & Activation