I used xobni about a month ago after a friend got the invite. I must admit, I didn't find any of the features useful. It looked really nice, but I just didn't care... Sorry guys.
I was using Xobni for a few months and really liked it, but wound up having to uninstall it a while back. With it installed, Outlook would hang upon launch about half the time. Once in a while, the whole plug-in (menu and side bar) would just disappear, and I'd have no idea how to get it back, and sometimes the search functionality would stop working. Hopefully it is (or is getting) more stable, because I really miss the functionality, and the plug-in I'm now using instead (X1) is horrendous.
Hey Matt, I just wanted to pass on to guys a big thumbs up.
Yesterday, I invited a bunch of people around the office to download xobni. A few minutes ago, Steve came by my desk. He was using your search to find stuff from 5 years ago. You should've seen the shit eating grin on his face when he started talking about how cool it was that he could find stuff so quickly.