Exchange 2007 setup shows the following error, what is the problem ? The readiness checks have all completed, -----Error:Active Directory operation failed on hhs-mail.hooghoudt.local. This error is not retriable. Additional information: An attempt was made to modify an object to include an attribute that is not legal for its class.Active directory response: 0000207D: UpdErr: DSID-03150F9C, problem 6002 (OBJ_CLASS_VIOLATION), data 0An object class violation occurred.Elapsed Time: 00:00:04------exchangesetup.log shows:[9/11/2007 2:35:35 PM] [1] [ERROR] Active Directory operation failed on hhs-mail.hooghoudt.local. This error is not retriable. Additional information: An attempt was made to modify an object to include an attribute that is not legal for its class.Active directory response: 0000207D: UpdErr: DSID-03150F9C, problem 6002 (OBJ_CLASS_VIOLATION), data 0[9/11/2007 2:35:35 PM] [1] [ERROR] An object class violation occurred.[9/11/2007 2:35:35 PM] [1] Setup is halting task execution because of one or more errors in a critical task.[9/11/2007 2:35:35 PM] [1] Finished executing component tasks.[9/11/2007 2:35:35 PM] [1] Ending processing.------application log shows:The description for Event ID ( 2152 ) in Source ( MSExchange ADAccess ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: ExSetupUI.exe, 5692, 1753, Error 6d9 from HrGetServersForRole.-----Rients

Did you solve that in the meantime? I get the very same error installing SP1 RTM in my 32 Bit test environment. Johann

Yes. Do not install the roles using setup.exe (or whatever it is called), use setup.com setup.exe does not generate this error when installing to the default path, Rients

The same happens when starting setup.com. I also tried setup.com /PrepareAD (after successfully running setup.com /PrepareSchema) and get the same error. I do not install roles but update an existing SP1Beta2 lab installation.