hii have 2 domain parent(a.com) and child(b.a.com) and exchange server 2007 installed on the same server with parent domain.i wantto usesame exchange server for child domain i also have to do a setting for it?and if it would be an additional domain(b.a.com) how i should set the exchange server for use it ?thanks/

Hi,Need a little more information here."i have 2 domain parent(a.com) and child(b.a.com) and exchange server 2007 installed on the same server with parent domain." are you saying that your Exchange 2007 is installed on the domain controller? This is not a recommended installation.".i wantto usesame exchange server for child domain i also have to do a setting for it?and if it would be an additional domain(b.a.com) how i should set the exchange server for use it ?"are you asking how you can use the same exchange server for the users in the child domain?have your run setup /PrepareDomainin b.a.com. It could be that when you installed your 1st exchange server you might have prepared the child domain.ref- http://technet.microsoft.com/en-us/library/bb125224.aspxref-I guess once your b.a.com is prepared you can just go ahead and create mailboxes for the users in the child domain.do let me know if it worked out for you.Regards...Taruj Bhattacharyahttp://technet.microsoft.com/en-us/library/bb288907.aspx

Hi,First, run Setup /DomainPrep in child domain.Second, create the accepted domain for the child domain.Third, create the E-mail Address Policiy for the child domain.After that, you can create the mail-enabled user for the child domain.Additionally, another similar thread as below for your reference:http://social.technet.microsoft.com/forums/en-US/exchangesvrdeploy/thread/4c46154f-d16c-49dc-97d0-33608117cbe4/ThanksAllen