Windows 10 Mail app began to malfunction contiurally. It repeatedly gave me errors when trying to check my Hotmail account, although it worked fine for Gmail. When I tried to repair the account, it said the repair was successful, but then gave the same error when I tried to check the account. I tried to delete and reinstall the Hotmail account, but when I did, the Mail add new account only produced a blank window. There was no account to choose. I sued several internet suggestions to remove the Mail app and reinstall it, but none worked until I tried this one:
I used option 3 to reinstall and re-register all Windows apps for all accounts. This worked, and Mail is working again. Thank you.