Find out who of your Outlook contacts may use Lync Federation

Using Office 365, you also get Lync 2010, and additional you can activate Federation which means you can add external contacts (who are not part of the same domain) if they also use federated Lync. Today, Loryan Strant tweeted the following: Naturally, I got very curious and wanted to find out who of my Outlook contacts might be a potential contact for my Lync. If you follow through various links, Details