It seems Microsoft has made LookOut available as a free download on their site. LookOut was a pretty fancy plugin for Outlook that made it possible to search a giant mailbox in a couple of seconds. Word on the street says that Microsoft bought LookOut to get at the search algorithm, which they intend to use on [msn.com](http://www.msn.com/) to compete with [google](http://www.google.com).
Anyway, you can download LookOut here:
[microsoft.com](http://www.microsoft.com/downloads/details.aspx?FamilyID=09b835ee-16e5-4961-91b8-2200ba31ea37&displaylang=en)