Hi Team, Can anyone confirm if microsoft supports Exchange 2010 DAG members running on different OS.Example Member1 running on windows 2008 r2 OS and Member2 running on 2008 <x64> OS. Thanks Senthil

DAG members must be running on the same OS version. From (Software Requirements Section): http://technet.microsoft.com/en-us/library/dd638104.aspx "Each member of the DAG must also be running the same operating system. Exchange 2010 is supported on both the Windows Server 2008 and Windows Server 2008 R2 operating systems. All members of a DAG must run either Windows Server 2008 or Windows Server 2008 R2. They can't contain a combination of both Windows Server 2008 and Windows Server 2008 R2."Tim Harrington | MVP: Exchange | MCITP: EMA 2007/2010, MCITP: Server 2008, MCTS: OCS | Blog: http://HowDoUC.blogspot.com | Twitter: @twharrington