http://support.msn.c...mail&ct=eformtschose the option for "close your account"
that's h ow to close a passport account
Close your account
You may be able to close your account right away, or you may need to:
Resolve any issues that are listed on the page before you can close your account.
Be directed to another site or service to close your account.
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Sign in to the Microsoft Passport Network if you're not signed in already.
Go to the MSN Account Services home page. Click Customer Support.
Click Close your account.
Read the information provided on the page to verify that you want to close your account, and then click Continue.
Note
When you close your account:
You will no longer be able to sign in to the Passport Network using your credentials (Unique information that you use to access restricted resources. For the Passport Network, credentials include your e-mail address and password. They may also include a mobile phone number and PIN, a smart card, or a security key.) .
Personal information that you have shared with sites and services is not automatically deleted and you may no longer be able to access that information. Therefore, you should sign in to those sites and delete your personal information before you close your account.
The closed account name cannot be used to open a new account for thirty days after the account is closed. If you want to reuse the closed account name to again sign up on the Passport Network, you can use the account name after thirty days have passed since the day you closed the account.
Another user could use your closed account name to sign up on the Passport Network after thirty days have passed since you closed your account .