Office for Mac Issues

How to Fix Microsoft Word Cannot Be Opened on macOS Sonoma

Maira Mehtab Sep 20, 2026 869 views

Question details

Microsoft Word and other Office applications fail to launch on macOS Sonoma 14.5, even after reinstalling the app. The issue appears closely tied to Microsoft AutoUpdate failures.

Product: Microsoft Word for Mac
Device & OS: macOS Sonoma 14.5
Scenario: Attempting to launch Microsoft Word or update Office applications via Microsoft AutoUpdate on a Mac running macOS Sonoma.
Observed behavior: Word and other Office applications bounce in the dock but cannot be opened. Reinstalling Word version 16.87 does not resolve the issue, and Microsoft AutoUpdate cannot be relocated or opened.

Before you start

Verify that your Mac is connected to a stable internet network and ensure you have your Microsoft account administrator credentials on hand before attempting to reinstall system-level update tools.

Solution 1Recommended

Reinstall and Update Microsoft AutoUpdate (MAU)

Since Office app crashes on macOS are often tied to a missing or corrupted Microsoft AutoUpdate tool, reinstalling it can resolve underlying launch issues.

Microsoft Word for Mac relies on the Microsoft AutoUpdate helper tool to verify application integrity and manage updates. If this background tool is corrupted during a macOS Sonoma update, Word may refuse to open completely.

Uninstall Current AutoUpdate

Open Finder, press Command+Shift+G, and go to '/Library/Application Support/Microsoft/'. Delete the 'MAU2.0' folder or the Microsoft AutoUpdate application if present.

Download the Latest MAU Package

Visit the official Microsoft Mac release history page and download the latest standalone installer for Microsoft AutoUpdate.

Install and Verify

Run the downloaded installer package. Once finished, restart your Mac to ensure the system recognizes the new helper tool.

Launch Microsoft Word

Open Microsoft Word from your Applications folder or Launchpad. The app should now successfully connect to the helper tool and open normally.

Verification Tip: You can verify the helper tool exists by checking your Mac's Login Items in System Settings and ensuring Microsoft AutoUpdate is allowed to run in the background.

Solution 2

Start macOS in Safe Mode

Safe Mode clears temporary system caches and disables third-party extensions that might be preventing Microsoft Word from opening.

Solution 3

Create a New Mac User Account

Creating a fresh user profile isolates the issue, helping determine if the application crash is due to corrupted preferences in your current macOS user account.

Free Microsoft Office alternative

Try WPS Office for Mac When Word Won't Open

If Microsoft Word continues to crash on macOS Sonoma and troubleshooting doesn't help, switch to WPS Office. It's a free, lightweight alternative that doesn't rely on Microsoft AutoUpdate, ensuring stable performance on macOS.

1. Install the App: Download and install the WPS Office application designed for macOS from the official website.
2. Open Your Files: Launch WPS Office, click 'Open' on the home screen, and select the Word document you were trying to access.
3. Resume Your Work: Edit and save your file in the native .docx format to maintain perfect compatibility with other users.

Fully compatible with Microsoft Office formats, allowing you to seamlessly open and save .docx files.Lightweight architecture that bypasses Microsoft AutoUpdate issues on macOS Sonoma.Familiar user interface ensuring zero learning curve when migrating from Microsoft Word.All-in-one app combining document creation, spreadsheets, presentations, and PDF editing.

microsoft office alternative - wps office

Frequently Asked Questions

Why did Microsoft Word suddenly stop working after updating to macOS Sonoma?

Major macOS updates like Sonoma can occasionally disrupt background dependencies, such as the Microsoft AutoUpdate tool. When Word cannot communicate with this helper utility, it will immediately quit or bounce in the dock without opening.

Will I lose my documents if I uninstall and reinstall Microsoft AutoUpdate?

No. Uninstalling or reinstalling Microsoft AutoUpdate or the Microsoft Word application itself only affects system and app files. Your locally saved documents and any files synced to OneDrive will remain completely intact.

What should I do if Word opens in Safe Mode but not in standard mode?

If Word functions properly in Safe Mode, it indicates a conflict with a third-party application, startup item, or font cache on your Mac. Try disabling background items in System Settings > General > Login Items, or remove recently installed custom fonts.

Is it necessary to keep Microsoft AutoUpdate installed on my Mac?

Yes, if you are using Microsoft Office applications. Microsoft AutoUpdate is required to verify licensing and deliver critical security and feature updates. Deleting it completely will often cause Office apps to crash on startup.

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