Hi everybody! I tried to install SP1 on our existing Exchange Server 2007 and can't find the problem why it stops. We have 2 DCs, a single domain and in general nothing special here. Error message from setup: Organization PreparationFailed Error:Active Directory operation failed on dc01.domain.info. 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. Log file: 12:26:39.855: Starting Collecting Data phase.12:26:41.443: Completed Collecting Data phase.12:26:41.458: Error (Rule name 'PreReq_fPassiveUninstallNoCMSPresentKey' referenced by rule 'PreReq_fPassiveUninstallNoCMSPresent' in input file is not defined) in format of rules in configuration file.12:26:41.487: Starting Postprocessing Rules phase.12:26:41.502: Completed Postprocessing Rules phase. Did anybody have the same problem and find a solution? Or any other hints for this problem? Thanks for your help! Juergen

Hi, please try to run the below cmdlt to prepare AD for Exchange sp1. -- setup.com /prepareAD After that, please try to run the below cmdlt to upgrade to Exchange sp1.(Note: DC1 should be the dc name of your first dc,DC2 should be the other one.) -- setup.com /m:upgrade-- setup.com /m:upgrade /dcC1-- setup.com /m:upgrade /dcC2 After that, Please try to run Microsoft Exchange Best Practices Analyze to do a health check, try to find any error related to the schema or Organization. You may post the detail here. J(Exchange Console-Toolbox- Best Practices Analyze) Also we recommend you to install MPSRPT_Exchange.exe to gather more detailed system status and configuration information.You may send these information toXiu Zhangfor further troubleshoot. How to install the Exchange edition of the Microsoft Product Support Reporting Tool http://support.microsoft.com/?id=870640 More information about upgrading to Exchange 2007 SP1: How to Upgrade to Exchange 2007 SP1 http://technet.microsoft.com/en-us/library/bb629489.aspx Hope it helps. Xiu

Hello! Problem is solved. There were connectors from Ferrari Fax (OfficeMaster) which caused the problem. Juergen

Glad to hear it solved!