Well another good news for customers and partners. Microsoft has demonstrated and proved they are indeed listening to customer and partner feedback. Exchange 2007 product team has taken a decision to support Windows 2008R2 platform. Most of the customers are running Exchange 2007 and they will not have quick plan to move to Exchange 2010 but they will still prefer to have their operating system to have latest version for improved manageability.
More information about this decision has been blogged over here.