Revoke Permissions Granted to a Site
Once you instruct Windows Live to give a website access to one of your Windows Live services that website will have access to your information, even when you are not logged in. If you no longer want a website to have access to your Windows Live information, you must revoke the permissions that were granted to the website.
The Windows Live Revocation Page
To revoke permissions that were previously granted to a website, or to see a list of websites and the permissions granted to them, visit the Windows Live revocation page at https://ux.cumulus.services.live.com/prux/default.aspx.
To revoke the permissions given to a website
Go to the Windows Live revocation page at https://ux.cumulus.services.live.com/prux/default.aspx.
Sign in to Windows Live ID using the same Windows Live account you used for granting permissions to the website.
Select the check boxes next to the websites and permissions you want to revoke and click Revoke.
The revocation page will refresh and show an updated list of sites and permissions. The sites and permissions revoked should not be listed anymore.