hai everybody who will help me! actually, i have parent domain DC01 and AditionalDomainController as EXG with exchange server. i want to remove child domain CHD server database which is strored in microsoft system manager->(DomainExchange)->Administrative group->First administrative group->servers->CHD(child domain server). when i am trying to remove as right clicking on CHD server->all tasks->remove.. but, i am getting a error message..as below ------------------------------------------------------------------ ""setup encountered an error while checking prerequisites for the component microsoft exchange server 0x8007202B (8235) a referal was returned from the server exchange system manager: id no:c103fc97 exchange system manager"" ----------------------------------------------------------------- and i removed all DNS entries from parent domain and ADC EXG also. please help me to resolve this problem regards, Sridhar.m