Is this compatible?I have a Native 2003 AD environment.In this environment, I have a 2003 Exchange Cluster running.I want to introduce a 2008 R2 server as a AD controller.I will run all 2008 schema updates for AD.Is this supported? I am concerned about my very unstable Exchange 2003 environment.

This is supported. http://technet.microsoft.com/en-us/library/ee338574%28EXCHG.80%29.aspx However if you are unstable I'd fix that before making any changes.Mark Morowczynski|MCT| MCSE 2003:Messaging, Security|MCITP:EMA 2K7,EDA Win 7,ES,SA,EA|MCTS:Windows Mobile Admin|Security+|http://almostdailytech.com