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 have to revoke the permissions granted to the website.
This document describes the steps to revoke the permissions given to a website.
The Windows Live Revocation Page
If you want to revoke permissions previously granted to a website or see a list of websites and the permissions granted to them, you have to visit the Windows Live revocation page at https://ux.cumulus.services.live.com/prux/default.aspx.
Revoking Permissions Granted to a Site
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Go to the Windows Live revocation page at https://ux.cumulus.services.live.com/prux/default.aspx.
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Sign in to Windows Live ID using the same Windows Live account you used for granting permissions to the website.
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Select the check boxes next to the websites and permissions you want to revoke and click Revoke.
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The revocation page will refresh and show an updated list of sites and permissions. The sites and permissions revoked should not be listed anymore.