Hi, Somehow I have deleted exchange administrative group FYDIBOHF23SPDL, now when I am trying to install e2k7 it shows an error while installing hub transport role"could not found default exchange administrative group". I am installing e2k7 in 2003 coexistence mode. and I have also run the tool "fixit" on the server as per guided by technet site to resolve this issue , but it didn't work. Please suggest some solution. regards SunilIT Guy

Hello Try to run this command and check it will create the Administrative Group again. Setup /PrepareAD /DomainController:DomainControllerName Thanks Mhussain

Hi Sunilchamp. Any update for your issue. You could follow below: (1) Demoted the EXCHANGE Server to a member server (2) Removed the Watermark from the HubTransportRole in the registry key HKLM\Software\Microsoft\Exchange\v8.0\HubTransportRole (3) Ran the setup.com /prepareAD, /prepareSchema & /pl Related inofmation: http://support.microsoft.com/kb/937358/en-us Regards! gavin