Hi, Can anyone help me with the exchange 2007 installation. Why cant I get Client Acess Roleand Mailbox Role installed? I had first restricted the access to IIS, but I took the restrctions away, because someone said that it doesnt work jet with them... maybe in SP1. Errorraport included. -Peter- Unable to create IIS (Internet Information Service) directory entry. Error Message is: Exception from HRESULT: 0x80005008. HResult = -2147463160 ************************ Client Access Role Failed Error: Server "" already has an OAB Virtual Directory "Default Web Site\OAB" existing in IIS, but not in Active Directory. Please use the IIS Manager to remove the OAB?virtual directory from IIS. Then recreate the virtual directory using the New-OABVirtualDirectory command.

have you tried what the errormessage says? remove OAB virtual directory and then create it again?