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Fix Microsoft 365 Showing Old Email Address During Reinstall on Mac
Question details
The user is unable to sign in with a new account because Microsoft 365 keeps defaulting to an old email address during the setup process on Mac.
- Product
- Microsoft 365
- Device & OS
- macOS Sonoma
- Scenario
- Reinstalling Microsoft 365 and attempting to sign in with a different user account.
- Observed behavior
- The sign-in screen continuously displays a previously used email address, ignoring the user's attempt to select 'Use Another Account'.
Ensure you have the correct login credentials (email address and password) for your new Microsoft account, and make sure you have saved all ongoing work before restarting your Mac.
Clear Microsoft 365 Credentials from macOS Keychain
Use this solution to remove leftover account data cached by macOS, forcing Microsoft 365 to ask for fresh credentials.
macOS stores application login tokens in its built-in Keychain Access tool. When you uninstall Microsoft 365, these tokens are often left behind, causing the application to automatically retrieve the old email address upon reinstallation.
Ensure all Microsoft Office applications (Word, Excel, PowerPoint) are completely closed on your Mac.
Click the Spotlight search icon (magnifying glass) in the top right corner of your screen, type 'Keychain Access', and press Return to open the application.
In the Keychain Access search bar, type 'Microsoft'. Select all entries related to Microsoft Office, Microsoft 365, or ADAL, right-click them, and select 'Delete'.
Restart your Mac computer. Once restarted, reinstall Microsoft 365 and open any Office application to sign in with your new email address.
Remove Old Account from macOS Internet Accounts
Use this solution if clearing the keychain does not work, as macOS might be syncing the old Microsoft account at the system level.
Switch to WPS Office for a Hassle-Free Experience on Mac
Tired of dealing with persistent login issues and complex subscription setups? WPS Office offers a free, lightweight, and user-friendly alternative to Microsoft Office. Experience powerful document editing on your Mac without frustrating account conflicts.
- 1. Download WPS Office for Mac: Visit the official WPS website and download the macOS installation package.
- 2. Install the Application: Open the downloaded .dmg file and drag the WPS Office icon into your Applications folder.
- 3. Open Your Files Seamlessly: Launch WPS Office and directly open your existing Microsoft Office files without needing complex account setups.
Frequently Asked Questions
Why does Microsoft 365 remember my old email address after I uninstalled it?
macOS is designed to retain user preferences and credential tokens in Keychain Access and Internet Accounts even after an application is deleted. This is intended to make reinstalling and logging in faster, but it causes conflicts if you want to use a different account.
What should I do if the old email address still appears after clearing Keychain Access?
If clearing the Keychain and Internet Accounts does not work, you can download and run the official Microsoft Office License Removal Tool for Mac. This specialized tool completely wipes all Microsoft activation files and product keys from your system.
Will deleting credentials from Keychain Access delete my Word documents?
No, clearing your Microsoft credentials only removes the stored passwords and login session tokens. Your actual Word documents, Excel spreadsheets, and PowerPoint presentations saved on your Mac or in OneDrive will remain completely unaffected.
