http://www.lookoutsoft.com/

What Is Lookout?

Lookout is a Microsoft OutlookTM plug-in that provides advanced, lightning-fast search capabilities to your mailbox. You can use Lookout to search your:

email
attachments
contacts
calendar
filesystem

Search results come back almost instantaneously. It’s like having Google for your mailbox! But, don’t take our word for it. Read what our customers have said about Lookout. Once you have it, it will change the way you read email.

I’m installing it now… We’ll see if its worth the price. Which is $0 btw.