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Xobni is an Outlook add-in that basically adds search, conversations and profiles to Outlook. When I first heard about Xobni, I was really excited to try it and was ecstatic when I got an invite a few months ago (I still have a few invites left, if anyone wants one).
That said, I'm about ready to give it up. The search, while better than Outlook's default search, is still no match for anything Google or Apple offer, and almost painful to use since while in "search mode" almost a quarter of the sidebar is covered in a completely out-of-place Yahoo web search. Conversations are also nice, but limited in usefulness due to their being restricted to the sidebar. Further, since I deal with only a limited amount of people via email, the profiles lack utility (though the auto-discovery of phone numbers is nice). To top it all off, Xobni often makes Outlook unresponsive (though responsive enough to tell me that it's not responding).
I still like the product, and despite it's flaws, I'm still using it since it's features (ever so slightly) outweigh its drawbacks, and was glad to hear that Microsoft may buy Xobni. This can only be good since proper integration into Outlook would likely fix any performance issues and enhance Xobni's feature set. As a lukeworm fan, I can only hope that Xobni continues to see improvements and a Microsoft acquisition looks to be one pretty sure way of making that happen.