Use the WUA_SearchDownloadInstall.vbs script provided by Microsoft.

References:

• https://superuser.com/a/462426

• Understanding Microsoft Work And Personal Accounts.
• How To Change The Login For Your Microsoft Account - critical if you have both a work and personal account that share an e-mail address.
• Remove Personal Account discussion on Microsoft Community.
• How to Close Your Microsoft Account

NOTE: Azure accounts cannot be closed. A subscription can be closed/removed, but the account remains. Neither can a credit card currently be removed from an account.