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Build Social Networks with Windows Live Contacts
Windows Live Contacts now allows people to use their Windows Live contact information (including Hotmail, Messenger, and Mobile contacts) with your site—while keeping complete control of their data.
A simplified development experience, with built-in Windows Live branding. The easy-to-adopt Contacts control allows users to sign in to Windows Live from your site and conduct a one-time transfer of contacts data. The control requires the user to select and approve contacts for transfer.
Try out the Contacts Control (Beta)
A RESTful API that works on Address Book objects. The Contacts API offers a more granular control over the user experience and allows users to grant and revoke permission to their data on a site-by-site basis. Windows Live ID Delegated Auth provides the protocols to manage the permissioning process.
Try the Interactive SDKGo to the Contacts API docs