Sign-in & Login Problems

How to Fix Microsoft 365 Showing an Old Email Address on Login

Maira Mehtab Sep 22, 2026 869 views

Question details

The user needs to remove an outdated email address that repeatedly appears when attempting to sign in to Microsoft 365.

Product: Microsoft 365
Device & OS: Mac / Web Browsers
Scenario: Signing in to a Microsoft 365 account via a web browser or a Mac desktop application.
Observed behavior: The login screen defaults to and displays an old or obsolete email address instead of prompting for the current account credentials.

Before you start

Ensure you have the login credentials for your current Microsoft 365 account on hand, and save any open documents before clearing application caches or removing license files.

Solution 1Recommended

Clear Browser Cache for Web Sign-in

Use this method if the old email address appears when you are signing into Microsoft 365 through a web browser.

Web browsers often cache your account credentials to speed up future logins. Clearing this cached data will force Microsoft 365 to ask for fresh login details.

Open Browser Settings

Click the menu icon (usually three dots or lines) in the top-right corner of your browser and select 'Settings' or 'Preferences'.

Access Browsing Data

Navigate to the 'Privacy and security' section and click on 'Clear browsing data'.

Clear Cached Data

Select 'Cookies and other site data' and 'Cached images and files'. Choose your time range (preferably 'All time') and click 'Clear data', then restart your browser.

Login Reset: Once the cache is cleared, navigating back to the Microsoft 365 login page will provide a blank slate to enter your correct email address.

Solution 2

Remove Obsolete Credentials from Mac Keychain

If you are using Microsoft 365 apps on a Mac, outdated account entries saved in Keychain Access can cause the old email to persist.

Free Microsoft Office alternative

Avoid Login Hassles with WPS Office

If resolving persistent credential caches and complex license file issues in Microsoft 365 is slowing you down, consider switching to WPS Office. It provides a lightweight, free alternative with seamless file compatibility and no frustrating login loops.

1. Download the Installer: Visit the official WPS website and download the free software for your operating system.
2. Install the Software: Run the downloaded installer and follow the quick on-screen instructions.
3. Open Your Files Seamlessly: Launch WPS Office and instantly open your existing Microsoft documents without wrestling with old login credentials.

Work offline easily without constant account verification or caching issues.Fully compatible with Microsoft Office formats including Word, Excel, and PowerPoint.Lightweight installation that runs smoothly on Windows, Mac, Linux, and mobile devices.Free to use with a highly familiar user interface, requiring zero learning curve.

Frequently Asked Questions

Why does Microsoft 365 remember an old email address?

Browsers and operating systems often cache your login credentials to speed up future sign-ins. If you switch accounts, the system might still default to the saved data until you manually clear it.

Will clearing my browser cache delete my Microsoft files?

No, clearing your browser cache only removes temporary site data and saved login information. Your Microsoft 365 documents are safely stored in the cloud via OneDrive and will remain completely unaffected.

What is the Office license removal tool for Mac?

It is an official utility provided by Microsoft designed to completely strip all Office license files from your Mac. This is often necessary when switching to a new account or resolving persistent login errors.

How do I sign out of all Microsoft 365 accounts?

To sign out, open any Office desktop application, click on your profile icon or name, and select 'Sign Out'. If you are on the web version, click your profile picture in the top right corner and choose 'Sign out'.

Login & Account Issues