Many months ago one of my work colleagues from Intrasource introduced me to Xobni (http://www.xobni.com/). If like me you are a heavy emailer, you may find Outlooks search facility clumbersome and slow. That’s where Xobni comes in, Xobni indexes all of your mail, both sent and received and enables an almost instant search facility. Taking the pain out of waiting for search results to be returned.
An overview of Xobni’s features:

Email Search
Before Xobni, searching for emails within Outlook was a slow and unrewarding experience. Now with Xobni’s instant search, the email you’re looking for appears immediately, as you type.
Xobni can build a list of search results for a single keyword 50 times faster than Outlook. Add that up and you will save hours each week.

People Search
One unique element of Xobni is that search results are split into two categories: people and mail. Why do we do this? We believe our users have an easier time remembering names over keywords. When you are looking for an old email message, you can usually remember the name of the person who sent it to you. Type that name into the search box, click on the people result, and you’ll get every conversation you had with that person, as well as all the attachments, contact information, and other information you may need.
Imagine that: a search for ‘Matt’ pulls up not only all the profiles of every Matt you’ve ever exchanged emails with, but also every email where the name Matt is mentioned. All in 0.3 seconds.

Yahoo! Mail Search
Did you know that Xobni is the only way to search your Yahoo Mail outside of Yahoo itself? You get all the benefits of Xobni, but applied to your Yahoo Mail: Xobni’s lightning-fast search, quick attachment discovery, contact information extraction, and integrations with all the major social networks. All you have to do is enable the Yahoo Mail search option in the Xobni options menu.

Contact Info Search
Xobni pulls contact info from email signatures, message bodies, Outlook contacts, as well as our partners: LinkedIn, Facebook, Hoovers, Skype, and Yahoo. If you need to quickly pull up the phone number, company name, and title before your meeting with Jim — simply type ‘Jim’ in the Xobni search box, and his whole profile of information will be at your fingertips.

Company Search
Who are all the people you know at Cisco? Xobni’s search feature also searches the email domains of every person you communicate with. Type ‘cisco.com’ into the xobni search box, and you’ll see everyone you’ve communicated with that has a cisco.com email address. The results are ordered from the person you’ve emailed with most at the top, to the least emailed at the bottom. Click on one of the results and open the Hoover’s extension to see their company’s corporate information.
You can find out more about Xobni and download the application over at http://www.xobni.com/