quite interesting article!!
If you are interested in Outlook Search tools, you maybe should take a look at a tool called Lookeen: http://www.lookeen.net

Really a good tool, maybe something for the future! :)

Quite interesting observations, that Xobni is a tool more for social networking than tackling the real email overload problem.

I work for a company called Nubli, and we try and solve this real problem of email overload, using machine learning algorithms.

I would be glad to invite you to test this product out, and do shoot me you feedback or comments. Would be glad to help.

Thanks,
Anup