This tool gives you the ability to find missing contact information.
Account Researcher is a tool that can be used to scrub the Internet for contact information such as email addresses and much more. Virtually all of my ACT clients are missing contact information that is important running their business. Account researcher gives you a seven day free trial and is approximately $79 per month. Depending on the nature of your business one updated contact could easily pay for this tool. My major concern for this product is how it might impact the terms of service of a website such as LinkedIn. If your prospects have a web presence, you will likely have better success with this product.
Account Researcher is worth a look: http://www.egrabber.com/accountresearcher/