This Microsoft/Facebook partnership is starting to get pretty hot and heavy. In fact, now you can view Microsoft Office documents directly from Facebook.
Microsoft Word. Microsoft Excel. Microsoft PowerPoint. All viewable with a single click through Office Web Apps. Now you can send Office documents via Facebook message to anyone. Regardless of whether or not they own Microsoft Office or not, they will be able to view the documents through Web apps via Office.com.
And if Facebook e-mail addresses take off, this feature could really catch on. Both as a boon to Microsoft Office and yet an additional incentive to make your @facebook.com account your primary e-mail address.