We are running Exchange 2003 and SharePoint 2003 and are needing to upgrade to Exchange 2010. Upgrading SharePoint to 2010 may not occur for 2 to 3 months after the Exchange upgrade. I have not been able to find any information on this upgrade scenario or possible issues. Microsoft support says it is 100% backward compatible, however I don't have alot of confidence in that answer. What are the gotcha's in this scenario?