Hello, thank you for reaching out to Microsoft Q&A.
Clear your browsing History, cache, and Cookies.
- Press Ctrl+H to open the browser's history, then select Open History page.
- Click Delete browsing data.
- Select Browsing history, cookies and other site data, and cache images and files.
- Click Clear now.
- Restart your web browser and sign in with your Microsoft account you want to have on https://outlook.live.com/
Then, if you're using the Edge web browser, go to edge://settings/autofill/passwords (Paste this link in the address bar)
Find live.com in the lists.
Delete any accounts you no longer use, or save their credentials.