You can't delete a contact from your Windows Live contacts. . .

You can also delete one by one with your mobile phone, but once you delete the msn contacts on your computer, they will also be deleted. This is the characteristic of Microsoft wp mobile phone. The same is true for wp8. The quickest way is to restore the original settings of the mobile phone and apply for an account. Log out of msn from your mobile phone account. Then sort out the contacts. In this way, you will get a good enjoyment.