i am facing a problem last time i configured an Exchange 2007 sp1 server on windows 2008 using our production AD (on windows 2003 server), unfortunately that exchange server crashed down & sum one else formated that server now the problem is our production AD (& deleted exchange made OUs (Universal Security Groups)in AD Users& Computers), every changings made by previous exchange is still there in AD... i tried to recover my exchange server organization through /m:recoverserver switch but all in vain, it stoped with error of deleted universal security groups.now i have to completely remove those changings made by previous exchange server then i want to create new exchange server, kindly help me out how to remove all those traces from AD...??? i am waiting for your positive reply so that i can proceed. Best Regards.

Go through AD preparetopology again and groups inkl permissions will be created. /PrepareLegacyExchangePermissions, /pl Prepares the permissions in a legacy forest.Use this parameter only if you have Exchange 2000 or 2003 servers in your organization./PrepareLegacyExchangePermissions:<domain FQDN>, /pl:<domain FQDN> Prepares the permissions for the specified domain./PrepareAD, /p Prepares the Active Directory forest for the Exchange installation. This will perform all the operations listed below in the local domain./PrepareSchema, /ps Prepares the Active Directory Schema for the Exchange installation./PrepareDomain, /pd Prepares the local domain for the Exchange installation./PrepareDomain:<domain FQDN>, /pd:<domain FQDN> Prepares the specified domain for the Exchange installation./PrepareAllDomains, /pad Prepares all domains in the forest for the Exchange installation. Then you can use the recoverserver switch to recover your server. if you dont want to recoverr your server use the recoverserver switch anyway and finally uninstall Exchange

first of all thanx 4 ur positive reply dude.. well i tried to recover my exchange server through recoverserver switch & that was failed coz of some universal distribution groups in AD then i tried to prepare my AD & schema but that was also failed with the error message of "server recently failed in disaster recover so prepare ad or shema can not be run" so wht to do now? tell me any appropriate solution for that.

Check the value of below registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\v8.0\<ServerRole>\Action If it has any values then take the backup of below registry path. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\v8.0\ Delete the value of Action registry key for all server roles and then prepare schema/AD. You may refer below article, which is for different problem but when any installation fails it keeps the registry with some value (like install) so when you do next installation it fails with previous installation error. When you try to install Exchange Server 2007 Service Pack 1 on an Exchange Server 2007-based computer, Setup fails