Xobni is an add-in for Microsoft Office that adds an extra column that provides search and social networking context to your inbox. Connecting with LinkedIn and Facebook, Xobni (that's "inbox" spelled backwards in case you missed it) brings in photos to put with emails and some general contact information like title and employer. Xobni also claims to have a email search experience that dynamically displays results while you type.
Most important about this latest refresh of Xobni is that it now works with Office 2010, and it will with with either the 32-bit or the 64-bit install. There is a free version and a plus version that include things like an advanced search and advanced filters. Download Xobni here