Social computing will play a big role in Microsoft's upcoming collaboration platform.
Microsoft calls the Site Mailbox a "central filing cabinet"--a place to store Exchange emails and SharePoint documents, both of which only site members can access and edit. Office 2013 makes it easier to file an email, document, or attachment in a shared project space: simply drag the item it into the Site Mailbox. From the user's perspective, the project documents and emails are stored together; on the back end, however, the content remains in the optimized stores: SharePoint for documents, and Exchange for email.
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