A little off the Exchange topic, but useful nevertheless:

We recently released publicly additional tabs  for Word, Excel and PowerPoint 2007 applications.

These are available from  http://www.microsoft.com/downloads/Browse.aspx?DisplayLang=en&nr=20&productId=4289AE77-4CBA-4A75-86F3-9FF96F68E491&sortCriteria=date

An example of this in Word is below.  Commands on this tab give you easy access to free content on Office Online that helps you learn Word 2007 quickly.