hi, when i preparing AD i see this error: Organization Preparation ......................... FAILED Active Directory operation failed on DC name. This error is not r etriable. Additional information: The parameter is incorrect. Active directory response: 00000057: LdapErr: DSID-0C090B38, comment: Error in a ttribute conversion operation, data 0, vece Many THX for your cooperation

Hello Did you Extended the Schema ? Check the windows firewall or any Anti virus if it is there stop it and rerun the command. Run the dcdiag /v /s:dcname > dcdiag.txt What is domain functional level and forest function level ? Thanks Mhussain

Post the event id 2080. Run the commands setup.com /ps and than run preparead and post the result.Gulab | Skype: gulab.mallah

Hello Any Update on this issue.Thanks Mhussain

Hi iman_mcitp, Per your description, it seems related with the DC issue. I would run dcdiag to confirm the DCs healthy, and confirm the replication configuration configured properly(outbound/inbound). Some information for you: http://technet.microsoft.com/en-us/library/bb125224(EXCHG.80).aspx How to Prepare Active Directory and Domains http://technet.microsoft.com/en-us/library/bb288907(EXCHG.80).aspx White Paper: Preparing Active Directory for Exchange 2007 Regards! GavinPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.