Microsoft has kicked in its technology guarantee for customers who are waiting to upgrade to Office 2010 but haven’t upgraded to Office 2007.  The simple thinking is that there is no reason for businesses to delay rolling out and familiarizing themselves with common UI elements like the Ribbon and the Open XML format.  Depending on how IT budgets and fiscal years align, customers will be able to leverage either Office 2007 or Office 2010 RC prior to the official release of Office 2010.

Read the Office 2010 Engineering blog for more details!