Hello, While trying to setup server roles I get the following errors: InstallLog: [4/25/2007 4:37:04 PM] [1] Processing component 'All Active-Directory Roles Common' (Creating the Exchange server configuration in the Active Directory).[4/25/2007 4:37:04 PM] [1] Executing 'Add-DelegatedGroupsToLocalAdminGroup -DomainController $RoleDomainController', handleError = False[4/25/2007 4:37:04 PM] [2] Launching sub-task '$error.Clear(); Add-DelegatedGroupsToLocalAdminGroup -DomainController $RoleDomainController'.[4/25/2007 4:37:04 PM] [2] Beginning processing.[4/25/2007 4:37:05 PM] [2] Used domain controller borgsphere.expanse.xx to read object DC=expanse,DC=xx[4/25/2007 4:37:05 PM] [2] Used domain controller borgsphere.expanse.xx to read object CN=Exchange Organization Administrators,OU=Microsoft Exchange Security Groups,DC=expanse,DC=xx[4/25/2007 4:37:05 PM] [2] Used domain controller borgsphere.expanse.xx to read object CN=Exchange Organization Administrators,OU=Microsoft Exchange Security Groups,DC=expanse,DC=xx[4/25/2007 4:37:05 PM] [2] Used domain controller borgsphere.expanse.xx to read object CN=BORGSPHERE,CN=Servers,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=Collective,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=expanse,DC=xx[4/25/2007 4:37:05 PM] [2] [WARNING] An unexpected error has occurred and a Watson dump is being generated: Class not registered [4/25/2007 4:37:05 PM] [2] [ERROR] Class not registered [4/25/2007 4:37:05 PM] [1] Exception : System.Management.Automation.CmdletInvocationException: Class not registered---> System.Runtime.InteropServices.COMException (0x80040154): Class not registered at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail) at System.DirectoryServices.DirectoryEntry.Bind() at System.DirectoryServices.DirectoryEntry.get_IsContainer() at System.DirectoryServices.DirectoryEntries.CheckIsContainer() at System.DirectoryServices.DirectoryEntries.Find(String name, String schemaClassName) at Microsoft.Exchange.Management.Tasks.AddDelegatedGroupsToLocalAdminGroup.GetLocalAdminGroup(String serverName) at Microsoft.Exchange.Management.Tasks.AddDelegatedGroupsToLocalAdminGroup.InternalProcessRecord() at Microsoft.Exchange.Configuration.Tasks.Task.ProcessRecord() at System.Management.Automation.Cmdlet.DoProcessRecord() at System.Management.Automation.CommandProcessor.ProcessRecord() --- End of inner exception stack trace --- at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input, Hashtable errorResults, Boolean enumerate) at System.Management.Automation.Parser.PipelineNode.Execute(Array input, Pipe outputPipe, ArrayList& resultList) at System.Management.Automation.Parser.StatementListNode.Execute(Array input, Pipe outputPipe, ArrayList& resultList)[4/25/2007 4:37:05 PM] [1] [WARNING] An unexpected error has occurred and a Watson dump is being generated: Class not registered [4/25/2007 4:37:05 PM] [1] [ERROR] Class not registered [4/25/2007 4:37:05 PM] [1] [ERROR] Class not registered [4/25/2007 4:37:30 PM] [0] End of Setup Eventviewer #1: Process ExSetupUI.exe (PID=2588). An remote procedure call (RPC) request to the Microsoft Exchange Active Directory Topology service failed with error 1753 (Error 6d9 from HrGetServersForRole). Make sure that the Remote Procedure Call (RPC) service is running. In addition, make sure that the network ports that are used by RPC are not blocked by a firewall. Eventviewer #2: Exchange Setup (build 8.0.685.25:Hub Transport Role) was started. Eventviewer #3: Watson report about to be sent to dw20.exe for process id: 2588, with parameters: E12, c-RTL-AMD64, 08.00.0685.020, ExSetupUI, S.DirectoryServices, M.E.M.T.AddDelegatedGroupsToLocalAdminGroup.GetLocalAdminGroup, S.R.InteropServices.COMException, b7a9, 08.00.0685.024 RPC is running. The Exchange Server is installed on the domain controller. There is no other server in this domain (it is a test machine). netdiag and dcdiag show no problems. I tried also the deletion and recreation of the profile. #1 is not actually the problem because this shows up because the setup was not finished and Active Directory Topology service is not running. What does AddDelegatedGroupsToLocalAdminGroup want to do? Is there something I have to do differently installing on the PDC? Does anyone know what the problem could be or if there is a workaround. Any help is highly appreciated. Heike