To quote my friend Alim, “I have been using it for a couple of days and it has revolutionized the way I work.”
I don't think I'm not your typical Outlook user. To put my usage into context, I have every email I've ever sent or received at Microsoft. That's about 3GB of .PST files - compressed. To open some of the larger .PST files it takes over a minute. But with Lookout installed, I can type in any search term and it will find mails in seconds. Really amazing.