We ar getting ready to migrate our Windows 2003 Domain to Windows 2008 R2 Domain and I need to know if there are any issues regarding our current Exchange 2003 ENT SP2 running on Windows 2003 ENT SP2. We are not going to upgrade the Exchange server so we don't run into the issues with Exchange 2003 on Windows 2008 R2, but all other servers will be upgraded.I cannot find anything that says there will be a problem, but want to make sure. Any help is appreciated.Thank you,NickNick Laurino

Exchange 2003 SP2 is not supported with Windows 2008 R2 AD environment.... Exchange Server Supportability Matrix http://technet.microsoft.com/en-us/library/ee338574.aspx Supported Active Directory Environments The following table identifies the Active Directory environments with which each version of Exchange Server can communicate. Supported environments are identified by an "X." An Active Directory server refers to both global catalog servers and domain controllers. Operating System EnvironmentExchange 2007 SP2Exchange 2007 SP1Exchange 2007 RTMExchange 2003 SP2Exchange 2000 SP3 Windows 2000 Server SP4 Active Directory Servers X X Windows Server 2003 SP1 Active Directory Servers X X X X X Windows Server 2003 SP2 Active Directory Servers X X X X X Windows Server 2008 Active Directory Servers X X X X Windows Server 2008 SP2 Active Directory Servers X X X X Windows Server 2008 R2 Active Directory Servers X X* Windows Server 2008 Read Only Active Directory Servers Windows Server 2008 R2 Read Only Active Directory Servers Amit Tank MVP: Exchange Server | MCTS: Microsoft Exchange Server 2010, ConfigurationMCITP: EMA | MCSA: M | Blog: http://ExchangeShare.WordPress.com

I appreciate the info, but was looking for a real world response from someone who might have tried it. I really didn't want to have to go to W2K8 SP 2 if I could jump right to R2 in order to use some of the features. I also planned to wait until Exchange 2010 is out before upgrading Exchange.I might just wait until next year.Thank you,Nick Laurino

Has the matrix been updated? When I look now it seems that Exchange 2003 SP2 is supported in a Windows 2008 R2 Domain. Uf this is correct - what changed?