Hi, I am having issues with Exchage 2007 Sp2 new installation (not upgrade), Here is my set up: I have a empty root domain and two child domains (win 2008 Sp1, Win2003 forest/domain functional level), one of the child domain have users and other child domain for Exchange (Exchange domain). I have prepared the schema on the root domain's DC (schema master), and ran setup /PrepareAD on Exchange domain (child domain), and also ran setup /PrepareDomain on the other child domain's DC that has all the users. When I try to install HUB and CAS role (Win 2008 Sp1), I get 'Could not find Default Administrator 'Exchange Administrator Group (FYDIBOHF23SPDLT)'. I have checked with ADISIEDIT (under CN=Administrative Group,CN=MyExchangeLab,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=mylabdomain,DC=net) and I can see the Administrator Group (FYDIBOHF23SPDLT) is there. All Exchange Groups have been created on Root Domain What am I doing wrong, would appreciate if you could put me in the right direction. Thank you in advance.

could you check below Click Start, click Run, type regedit in the Open box, and then click OK.Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\v8.0\HubTransportRole In the details pane, right-click Watermark, and then click Delete.At the command prompt, type Setup.com /preparead to install Exchange 2007.francky

Hello A Kashem, Thanks for the update and I am glad to hear the installation issue was fixed. For your new question, I suggest you create a new thread so that your question will be more widely cared by other people on this forum. Thanks for your understanding. Thanks, Simon

Thank you Simon and everyone. All problems have been resolved and CCR/CMS installation after installing the passive node.