To permanently delete your MSN email address, you can follow the steps below:
We recommend you to backup all the emails, contacts and any other account information that you think you may need anytime in future. Once you delete the account, all the information within the account will be permanently deleted. Also, any emails sent to this address after the account is deleted will be sent back to the sender.)
1.Go to http://www.hotmail.com
2.Enter your MSN email address (the one which you wish to delete) and the associated password in the respective fields and sign in to the account.
3.Go to "Help" section located on the top of the page and type "Close Account" into the keyword section therein. Hit "Enter"
4.It will display a link for closing the account. Click on the link and you will be redirected to a webpage where you can initiate the process of closing your account.
5.Click "Close Account" and then click "Yes". This will close your account permanently.
Hope this will resolve your issue.