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Product Key Issues

Can a Microsoft Office 2021 1 PC/Mac Key Work on Windows?

Kushani NimanthikaKushani Nimanthika Oct 12, 2026 869 views

Question details

The user wants to clarify if a retail Microsoft Office 2021 product key designated as "1 PC/Mac" can be used to activate the software on a Windows computer.

Can an Office 2021 1 PC or Mac Key Work on Windows?
Product
Microsoft Office 2021
Device & OS
Windows/Mac
Scenario
Activating a new Microsoft Office 2021 license using a dual-labeled retail product key.
Observed behavior
The user is seeking confirmation on whether the "1 PC/Mac" label permits installation specifically on a Windows operating system.
Before you start

Ensure you have a stable internet connection, an active Microsoft account, and that your Windows PC meets the minimum system requirements for Microsoft Office 2021.

Solution 1Recommended

Activating Office 2021 on Windows using a 1 PC/Mac Key

You can successfully redeem a "1 PC/Mac" key on a Windows PC. The label indicates you have the flexibility to choose either operating system for your single activation.

A retail Microsoft Office 2021 key labeled “1 PC/Mac” is designed to give you the choice of operating system. It works perfectly on a supported Windows PC.

However, it is crucial to understand that this license is valid for one device only. If you choose to redeem and activate the product key on your Windows PC, you cannot simultaneously use that same key to activate Office on a Mac.

1
Visit the setup page

Open a web browser on your Windows PC and navigate to the official Microsoft Office setup website (setup.office.com).

2
Sign in to your account

Click the "Sign In" button and log in with the Microsoft account you want to associate with your Office 2021 license.

3
Enter the product key

Carefully type your 25-character product key into the provided fields. The system will automatically detect the key.

4
Download the Windows installer

Select your region and language, then click "Next" to download the correct Office 2021 setup file for your Windows PC.

5
Complete installation

Run the downloaded installer file and follow the on-screen prompts to complete the setup on your Windows machine.

Activating Office 2021 on Windows using a 1 PC/Mac Key
Single Device Limitation: Once activated, the license is permanently tied to your Microsoft account for use on that single Windows PC. You cannot install it on a second computer without deactivating the first.
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Frequently Asked Questions

Can I use my Office 2021 1 PC/Mac key on both a Windows PC and a Mac simultaneously?

No. The “1 PC/Mac” label means you can choose to install the software on either one Windows PC or one Mac. It does not provide a license to use the software on both platforms at the same time.

What happens if I buy a new Windows PC? Can I transfer my Office 2021 license?

Yes, retail licenses of Office 2021 are generally tied to your Microsoft account rather than the hardware. You can transfer the installation to a new Windows PC by uninstalling it from the old computer and reinstalling it on the new one through your Microsoft account portal.

Do I need a product key if I use WPS Office instead?

No, WPS Office offers a powerful free version that does not require a complex product key to get started. You can simply download, install, and create documents right away.