One of our mailstore was crash, we have reinstall again the mailstore server. We are not able to use the same hostname for mailstore; when we join the domain it said the hostname taken. We found that the old mailstore's hostname still persist at DC. I think this was the reason why we can not use the same hostname. How can we remove the failed mailstore from DC?

If the mail store server was a member server then please logon to the Domain Controller got to the Active Directory Users and computer ...> Expand the Domain name ...>Go to the computers OU and delete the computer name form there. It the mail store server was also a DC then you should do a meta data clenaup http://support.microsoft.com/kb/555846 http://www.virmansec.com/blogs/skhairuddin

Hello, just go to dsa.msc (AD UC) and delete the wanted account. If this server was a DC then you have to perform a metadata cleanup. This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner 2010 / 2011 Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows 7, Configuring Microsoft Certified IT Professional: Enterprise Administrator Microsoft Certified IT Professional: Server Administrator

Hi In addition,see the below links for metadata cleanup. http://www.petri.co.il/delete_failed_dcs_from_ad.htm http://awinish.wordpress.com/2011/05/08/metadata-cleanup-of-a-domain-controller/Best regards Biswajit Biswas Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. MCP 2003,MCSA 2003, MCSA:M 2003, CCNA, MCTS, Enterprise Admin

check out this link it might help: http://policelli.com/blog/archive/2008/05/24/windows-server-2008-active-directory-domain-services-metadata-cleanup/Every second counts..make use of it.

Hello, if the server was Domain Controller a metadata cleanup is required, otherwise remove it from AD UC and DNS zones. http://msmvps.com/blogs/mweber/archive/2010/05/16/active-directory-metadata-cleanup.aspxBest regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

Thank everyone for excellent answer!! I have succesfully remove the failed AD from domain controller.