Microsoft 365: How to Fix Read-Only Documents on a Mac

Overview

Some Mac users may encounter an issue where Microsoft 365 applications (Word, Excel, PowerPoint, etc.) open documents in Read-Only mode, preventing editing and saving. This usually happens because of corrupted credentials stored in the Mac’s Keychain or outdated license information.

This guide walks you through step-by-step instructions to resolve the problem so you can get back to editing and collaborating on your files.

Steps to Fix the Issue

1. Close Microsoft 365 Apps
   • Sign out of your account (Word → Sign Out).
   • Quit all Microsoft 365 applications (Word, Excel, PowerPoint, etc.).
2. Open Keychain Access
   • Use Spotlight Search (Cmd + Space).
   • Type Keychain and open Keychain Access.

     

3. Delete Microsoft Keys in Keychain
   • In Keychain Access, use the search bar to search for “Microsoft.”

     

   • Delete any items that contain “Microsoft.”
   • Close Keychain Access.
4. Sign Back In
   • Open Microsoft Word.
   • Sign in again with your ULID@louisiana.edu credentials.

     

   • Check if you can now edit your documents.
5. Reinstall Office (if Needed)
   If the issue persists:
   • Uninstall Microsoft Office from your Mac.
   • Download a fresh version from the Microsoft 365 Portal.
   • Install and sign in with your ULID@louisiana.edu credentials.
6. Further Help
   • If you still can’t edit, follow Microsoft’s Remove Office License Files guide.
   • Or, contact the IT Service Desk for assistance.

What to Expect When It’s Fixed

• Microsoft 365 documents will open in editable mode.
• You will be able to edit, save, and collaborate normally.