Office for Mac Issues

Fix Office 2021 for Mac Not Working After macOS Sequoia Update

Maira Mehtab Sep 28, 2026 869 views

Question details

Users need to resolve an issue where Microsoft Office Home and Business 2021 for Mac fails to function or activate properly after a system update.

Product: Office Home and Business 2021 for Mac
Device & OS: macOS (Sequoia)
Scenario: Attempting to launch and use Office applications after upgrading the Mac operating system to macOS Sequoia.
Observed behavior: Office applications stop working, exhibiting activation loops or version-detection errors due to corrupted or incompatible leftover license files.

Before you start

Ensure you have your Microsoft account login credentials associated with your Office purchase handy and verify that all your recent documents are backed up to OneDrive or a local drive.

Solution 1Recommended

Perform a Complete Cleanup and Reinstall of Office for Mac

Completely removing all Office applications and clearing the license files before reinstalling is the most effective way to resolve activation and version-detection issues after a macOS update.

A common reason for failure after a macOS Sequoia update is the incomplete removal of Office applications. If any residual files or old license data remain, the new installation will fail to activate properly. You must perform a completely clean uninstallation before reinstalling from your official Microsoft account.

Remove Office License Files

Download and run the official Microsoft license removal tool for Mac to clear out corrupted activation data and previous license keys from your system.

Uninstall All Office Applications

Open the 'Applications' folder on your Mac and drag every Microsoft app (Word, Excel, PowerPoint, Outlook, OneNote) to the Trash. Ensure no Office applications are left behind.

Clear Remaining Support Files

Open Finder, press Command+Shift+G, and type '~/Library'. Check the 'Containers' and 'Group Containers' folders to remove any leftover Microsoft-related files.

Reinstall from Microsoft Account

Go to the Microsoft account services and subscriptions page in your web browser. Sign in with the account linked to your Office 2021 purchase and download the latest compatible installer.

Activate the New Installation

Run the downloaded installer. Once finished, launch any Office application like Word and follow the on-screen prompts to sign in and activate your license.

Thorough Removal Required: Many users report that their first reinstallation attempt fails because they did not remove every single Office application. Double-check your Applications folder before downloading the new installer.

Free Microsoft Office alternative

Switch to WPS Office for a Seamless Mac Experience

If Microsoft Office updates and activation issues continue to disrupt your workflow on macOS, consider switching to WPS Office. It provides a lightweight, reliable, and free alternative that runs flawlessly on the latest Mac systems without complex activation loops.

1. Download the Mac Installer: Visit the official WPS Office website and click the free download button specifically designed for macOS.
2. Install WPS Office: Open the downloaded .dmg file and simply drag the WPS Office icon into your Applications folder.
3. Open Your Files Seamlessly: Launch WPS Office and immediately open your existing Word, Excel, or PowerPoint files without worrying about formatting loss or activation errors.

Fully compatible with Microsoft Office formats, including .docx, .xlsx, and .pptx.Lightweight design that runs smoothly on the latest macOS updates like Sequoia.No complicated license files or activation loops to manage.An intuitive all-in-one interface for documents, spreadsheets, and presentations.

microsoft office alternative - wps office

Frequently Asked Questions

Why does Office 2021 stop working after updating to macOS Sequoia?

Major macOS updates can sometimes cause compatibility conflicts with existing Office license files or application caches, preventing the software from authenticating your purchase or launching correctly.

Do I have to uninstall every single Microsoft app before reinstalling?

Yes, incomplete removal is a common cause for the reinstall failing. You must ensure all Microsoft apps, including Word, Excel, PowerPoint, Outlook, and OneNote, are moved to the Trash before installing the fresh version.

Will uninstalling Office for Mac delete my personal documents?

No, uninstalling the Office applications does not delete your personal documents or files. However, it is always recommended to back up your important files before performing system changes.

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