Not sure what's your exact goal.
You can remove both Windows mail and Outlook (diff apps) via the classic uninstall using the control panel, or WindowsAppBoss to remove any metro app, that's for the apps at least.
As for your Outlook account, if that's the goal, you can delete it (the account) inside your mail program. Also, as far as I can remember, outlook/hotmail will delete/disable your account as long as you don't login over a period of 6 months (from the top of my head, this may have changed).
There is also a way to reset your password, here:
Reset a forgotten Microsoft account password - Microsoft Support