Official Google Enterprise Blog: Upgrade here:
"This week Microsoft will take its Office 2010 suite out of beta. If you’re considering upgrading Office with Office, we’d encourage you to consider an alternative: upgrading Office with Google Docs. If you choose this path, upgrade means what it’s supposed to mean: effortless, affordable, and delivering a remarkable increase in employee productivity. This is a refreshing alternative to the expensive and laborious upgrades to which IT professionals have become accustomed.
Google Docs has been providing rich real-time collaboration to millions of users for nearly four years. It lets employees edit and share documents, spreadsheets, and presentations in the browser from anywhere in the world. We recently made tremendous strides in improving Google Docs formatting, speed and functionality, and a growing number of companies are now using it as their primary productivity software."