How to Activate Office 2021 for Mac After Canceling Microsoft 365

This situation is a license comparison problem, not a document-format problem. Excel, Word, and the installed Office apps can look identical, but the active license can still be tied to Microsoft 365 instead of the separately purchased perpetual copy.

Canceled subscription, still have Office for Mac

The subscription was canceled, but the Mac still shows the Microsoft 365 license as the active activation state.

The app is not switching by file type. It is using whichever Office license is currently stored and recognized on macOS.

Remove the Microsoft 365 license files, restart the Mac, and sign in with the account linked to the owned Office license.

Microsoft 365 vs. Office 2021 on Mac

Why Excel still asks for a subscription

The source indicates the Mac apps were still tied to the Microsoft 365 license. There is no supported file-by-file switch that marks documents as “owned” versus “365.”

• The prompt to subscribe is tied to app activation, not to the workbook itself.
• If About Word shows Version 16.78.3 and the license says Microsoft 365 subscription, the subscription identity is still active.
• The practical decision point is whether you have a valid Office 2021 account or other perpetual Office account available to sign in after removing the 365 license.

How to confirm which license is active

Before changing anything, verify the current activation state inside an Office app. The source specifically confirms the useful check is the About screen.

Open Word and check About Word

Launch Word on the Mac, then open the About Word window. The source shows this is where the version and license label appear.

Expected result: you can read the exact version number and whether the app says Microsoft 365 subscription or another license type.

If it says Microsoft 365

The subscription license is still the active identity on that Mac.

If you own Office 2021

You need the account associated with that purchase ready before reactivating.

You cannot tag individual Excel files to open under one license and other files under another.

Switch the Mac from Microsoft 365 to the owned license

The source-backed fix is to remove the Microsoft 365 license files, restart the Mac, reopen Office, and sign in with the account tied to the purchased Office copy.

Remove the Microsoft 365 license files

Use Microsoft’s Mac license removal process referenced in the source: How to remove Office license files on a Mac.

Expected result: the stored Microsoft 365 activation is cleared so Office can prompt for a different eligible account.

Restarting is part of the source guidance. It helps the Mac reload Office activation state before you sign in again.

Reopen Office and sign in with the purchased-license account

Open Word or Excel again and sign in with the account associated with the owned Office edition, such as Office 2021.

Verification step: return to About Word and confirm the license no longer shows Microsoft 365 subscription.

What the version screen tells you

The source confirms a real example: Version 16.78.3 with the license shown as Microsoft 365 subscription. That means the installed app is still activated under the subscription identity.

• It does not mean you lack a perpetual license. It means the current activation has not switched yet.
• There is no separate “default application” toggle in the source that swaps between two installed Office license types for the same app.
• The deciding factor is the account you sign in with after the Microsoft 365 license files are removed.

Will removing the license affect saved documents?

the available guidance is clear: removing the Microsoft 365 license does not affect documents already stored in a Mac location.

Documents saved on your Mac remain in place. The license change affects activation, not the existence of those files.

You still need a valid account for the one-time purchase edition if you want Office apps to activate under that license after the switch.

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Activate Office 2021 for Mac After Canceling Microsoft 365 FAQs

Why does About Word show Microsoft 365 subscription if I bought Office 2021?

Because the installed Office apps are currently activated with the subscription license files and account. The source-backed fix is to remove the Microsoft 365 license files, restart the Mac, and sign in with the account linked to the Office 2021 purchase.

Can I switch a specific Excel file from Microsoft 365 to the owned Office version?

No file-level ownership switch is established in the source. The supported mechanism is app activation on the Mac, so the change must be made by removing the active Microsoft 365 license and signing in with the perpetual-license account.

Why does Excel on my Mac still ask for a subscription after I canceled Microsoft 365?

This happens because the Mac still shows the Microsoft 365 license as the active activation state. The app uses whichever Office license is currently stored and recognized on macOS, rather than switching by file type or document.

How do I switch from a canceled Microsoft 365 subscription to my purchased Office license on Mac?

To resolve this, you must remove the Microsoft 365 license files using Microsoft’s Mac license removal process, restart the Mac, reopen Office, and sign in with the account associated with your purchased perpetual license (such as Office 2021).