When adding Microsoft Email account in Windows Mail application or setting the Microsoft Teams, Windows forcefully associate that account with Windows Account. Unfortunately if you remove the account that email will also disassociate from Mail and Teams application.
Below are the steps to remove the email from Windows Account:
1. Open Setting by pressing Windows + i buttons or from the gear icon in Windows menu.
2. Now in new window find and click on Accounts.
3. In new window click on Email & accounts.
4. Under Accounts used by other apps, click on your email and Remove button will appear.
5. Click on Remove.
6. Now click on Your Infor and under profile picture it should be Local Account.
All done. Hope this helps.