Hi there was a dsimmilar thread, with installing in a "Windows 2008" environment but this is a little different.I set up the following Test Scenario:- Install Win 2008 R2 (RC)setup a new forest / domainand raise forest functional level to Win 2008 R2- Install Win 2003 as member server and install Exchange 2003- Install Windows 2003 and Install Exchange 2007 SP1, does not work because of the following error"Cannot find at least one domain contoller running Windows Server 2003 Servie Pack 1 or later ... "Installing a Windows 2003 DC is not possible anymore because of the Forest Functional level. I would understand that Windos 2008 Beta is a problem, but Windows 2008 RC or is this more a problem of the Exchange SP1 setup routine and it will be fixed with SP2 ???

Hi, Windows Server 2008 R2 has not release yet and it is still running on RC stage. So New operating system may not be work with old software such as Exchange 2007.it might be support in Exchange 2007 Sp2 on Q3.If you want to test exchange 2007 on windows 2008 I will suggest testing it on windows 2008 Enterprise edition or Standard edition instead R2.RegardsChinthaka

Hi, Windows Server 2008 R2 has not release yet and it is still running on RC stage. So New operating system may not be work with old software such as Exchange 2007.it might be support in Exchange 2007 Sp2 on Q3.If you want to test exchange 2007 on windows 2008 I will suggest testing it on windows 2008 Enterprise edition or Standard edition instead R2.Regards Chinthaka I am testing Exchange 2007 on Windows 2003, thats supported. But the Forest Functiional level is 2008 and there is no Windows 2003 Domain Controller installed, thats the problem I have.

HI, Yes Forest functional level "WindowsServer2008"is supported with Exchange 2007 Sp1.But you have mentioned forest functional level as a "WindowsServer2008R2" in above post."WindowsServer2008R2" functional level still running on RC stage, SO forest functional level R2 might casewith exchange 2007 Sp1.Regards Chinthaka

I set up a new environenment based on Windows 2008 R2 with "Forest Functional level 2003" and that does not work either. I therefore assume that Exchange 2007 SP1 is not able to run in Windows 2008 R2 only envrionment.

HI, I am assuming you are trying to install Exchange 2007 Sp1 on Windows 2008 R2.Exchange 2007 Sp1 is doesnt support install on Windows 2008 R2 yet because Windows 2008 R2 hasn't release yet.refer Below System requirment URL.Exchange 2007 System Requirements==============================http://technet.microsoft.com/en-us/library/aa996719.aspxRegardsChinthaka

HI, I am assuming everything going wellPlease let us know if you have any concerns RegardsChinthaka

HI, I am assuming everything going wellPlease let us know if you have any concerns Regards Chinthaka ... sorry I give up posting here because the problem isnt't understood. I know that Exchange 2007 isn't supported to install on Exchange 2008 R2, it's installed in a Windows 2008 R2 Forest with only Windows 2008 R2 DC's and that doesn't work. I figured out that the ExBPA checks test-health which is running during installation doesn't recognoice the 2008 R2 Server as a GC and that should work even on a RC, from my point of view.

... and finally here is the answerhttp://msexchangeteam.com/archive/2009/09/02/452284.aspx