Microsoft Office for Home and Business for Mac 2021

Hello karen breitman!

Based on what you described, your Office Home & Business 2021 for Mac (one‑time purchase) has recently stopped recognizing your license and is now prompting you to activate Microsoft 365 instead.

This issue can happen when the Mac is using the wrong Office build (for example, the App Store version) or it is stuck on old license data.

You might start by signing in at your Microsoft account (if the product was redeemed or set up with one) and checking Services & Subscriptions to confirm that your one‑time Office purchase appears there. If it does, one option to try is uninstalling the current Office apps and then reinstalling them directly from Microsoft rather than from the Mac App Store (since App Store versions typically require a Microsoft 365 subscription).

If the issue continues, you can try using the official Mac License Removal Tool, then restart your Mac and attempt to activate Office again.

Note: The license removal tool only clears saved activation/licensing data on your Mac, it does not delete your purchase or invalidate your license. However, please make sure you still have access to the correct Microsoft account associated with your original Office purchase, as you will need to sign in again to reactivate it after running the tool.

Hope this could help. Feel free to post back if you need any further clarification or assistance!

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For Office Home & Business 2021 for Mac (a perpetual, one‑time purchase), activation should not force a Microsoft 365 subscription, but several issues can make it look that way.

Use these steps to get the perpetual license working again:

1. Confirm the correct product/version
   Office 2021 for Mac must be installed and activated with the account or product key associated with that perpetual license. If the Mac currently has Microsoft 365 apps installed, they will try to activate as a subscription instead of using the perpetual license.
2. Remove any existing Office apps that may be conflicting
   Uninstall all current Office apps so they do not default to Microsoft 365 activation:
   1. Close Word, Excel, PowerPoint, and Outlook.
   2. Open Finder → Applications.
   3. Select Word, Excel, PowerPoint, and Outlook, then control‑click and choose Move to Trash, then empty the Trash.
3. Reinstall Office 2021 for Mac from Microsoft
   After removing the apps, reinstall the perpetual Office build instead of the Microsoft 365 build. Use the official Office 2021 for Mac installer package from Microsoft:
   • Office 2021 for Mac Installer
   Once downloaded, open the installer package and complete the installation. When installation is complete, the apps can be activated and used with the perpetual (one‑time) license.
4. Activate with the correct account or product key
   After reinstalling:
   • Start Word or another Office app.
   • When prompted to sign in or activate, use the Microsoft account that was associated with the Office Home & Business 2021 purchase, or follow the product‑key activation flow if applicable.
   • Ensure that the sign‑in screen is for the perpetual Office 2021 product and not for Microsoft 365 subscription activation.

If activation still only offers Microsoft 365 and will not accept the perpetual license, fully removing the apps as above and reinstalling from the Office 2021 for Mac installer is the supported way to restore the perpetual license on the Mac.

References:

• Microsoft Office activation and the Mac App Store
• What to try if you can't install or activate Office for Mac