I have an existing AD forest that has one DC that maps to Exchange 2003, another DC that maps to Exchange 2000, and now I've added a thirdDC thatmaps tomy Exchange 2007 users and e-mail addresses.This is a development/test environment, which is why I have it setup this way.I did one Exchange 2007 installation, and it had a few issues, but it came up running.I am now trying to add a second Exchange 2007 server to my Exchange 2007 domain, and it is giving me errors.1)Cannot find a recipient update service2)Could not find the Exchange Install Domain Servers global group...For (2), it is telling me it can't find it for my AD server that I have associated with my Exchange 2003 domain, and not the AD server I have for my Exchange 2007 server domain.I don't want to break my 2003 and 2000 Exchange Servers, which is why I am posting.To install Exchange 2007, do I really need to touch my AD servers that are for Exchange 2000 and 2003 servers that I will not be upgrading?

Hi, Please Run setup /PrepareDomain:<FQDN of domain you want to prepare> with [/DomainController:< domain controller >] to prepare a specific domain. /DomainController parameter is used to specify the domain controller to use to read from and write to ActiveDirectory during setup. You can use NetBIOS orfully qualified domain name (FQDN) format. How to Modify an Exchange Installation http://technet.microsoft.com/en-us/library/bb124273.aspx How to Prepare Active Directory and Domains http://technet.microsoft.com/en-us/library/bb125224.aspx Regards, Xiu