Daniel Escapa has an item in his blog that you might find interesting. Here's an excerpt:
Dwayne Smith: Unum's two million dollar man

Recently I found that Unum, a Fortune 500 company that provides long term and short term disability, group life and long term care insurance for more than 100,000 companies, uses OneNote 2007! Looks like they save over $2 million by switching to OneNote by going to a paperless system. In the economic conditions companies are always looking to save money and get the most of out of their IT investments (wow I didn’t mean to sound like a marketing person).
Anyhow so I got access to an article written about Unum’s story and man behind it all: Dwayne Smith.