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At the moment the Outlook 2010 Social Connector only works with Exchange and with local SharePoint installations. However, Microsoft has announced that there will be an SDK, and you'll be able to link in to other social networks — giving you more information about your contacts.
Protected View doesn't just stop macro malware from running — it also stops you from printing documents you've downloaded or received. You'll need to be sure that a document is safe before printing, as enabling printing takes it out of the sandbox.