The Microsoft camp frequently points out how Microsoft Office has all the features that businesses want right now and therefore wants you to conclude that you don't need Google Apps, but this misses the main point; Google Docs are complementary to Microsoft Office.
Google Docs has been providing rich real-time collaboration to millions of users for nearly four years. You can edit and share documents from the browser from anywhere in the world. A growing number of corporations are using it as their primary productivity software but there's no need to.
Google Docs makes Office 2003 and 2007 better because you can store any file in Google's cloud and share them in their original format with anyone on the internet. No more guessing if you have the latest version.
Google Docs represents a real alternative for companies: a chance to get the collaboration features you need today and end the endless cycle of "upgrades".
Try it out free for 30 days. The only thing you have to lose is a server or two.