I added a user a few weeks ago and now I can't delete the account because of the attached message.
I read the article below, but the account didn't have the box checked. How do I delete it.
By default, you need to uncheck the box “Protect object from accidental deletion”.
To do this, you need to activate Advanced Features on ADUC console.
Click on : Start > run > dsa.msc> View > Advanced Features. Now right click on the object that you want to remove and then Properties, Click on Object tab and Uncheck the box Protect object from accidental deletion and try to delete.