Active directory response: 00000057: LdapErr:DSID-0c090c30. comment: Error in attribute conversion operation, data 0, v1db0. Environment details: OS: Windows 2008 SP2 Exchange Version: Exchange 2007 SP3 RU1 I had reviewed Knowledge Base Article: http://support.microsoft.com/kb/2457729. I would like to understand the impact on the Exchange environment if Setup.com /prepareschema is run again?

Yes it's safe to run again. I would run setup /p (which is setup /prepareAD) This actually runs and verifies that schema has been properly extended through verification tasks and if not will re-run setup /prepareschema. There are times when people need to re-run setup /p (which also does setup /ps) such as in instances when users accidently delete the Exchange security groups or mucked around with some settings in adsiedit or mucked with permission settings beyond fixing without great level of effort. White Paper: Preparing Active Directory for Exchange 2007 http://technet.microsoft.com/it-it/library/bb288907(EXCHG.80).aspx James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Thanks for the Reply Jamestechman.

Hi Lascano Do you solve the your issue? If jamestechman’s advice is useful, please mark his answer. Please 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.