We are experiencing installing Exchange 2007. Last time we didn't succeed uninstalling the mailbox role of exchange, so we reininstall the OS and install exchange 2007 in another machine, but it seems there is some settings remaining in the DC or AD, some of our tests can find the old exchange. Do you know how to remove old exchange completely? We are installing ExchangeUM.

Hello Xin, Proper way to remove Exchange 2007 server from AD is to uninstall it properly. If uninstall was not successful then you can install a temporary / virtual server, recover a server which was not uninstalled properly, with /recoverserver switch and uninstall it properly. This procedure will remove your server from AD properly. References: How to Recover a Lost Exchange Server Remove Exchange 2007 session of -> How to remove Exchange 2007 from a computer

Thanks Amit. I have tried /recoverserver install but after that I was prompted it will not be removed because of disaster recovery.

Was it recovered properly and then while uninstalling it was prompted? If so then you can set registry keys and try to uninstall it. How does Exchange 2007 setup know to resume a failed setup? You can post here error message which was prompeted during uninstall and setup log also for further invesigation.

thanks for the quick response. I will try as the link specified.