Exchange 2003 (on Windows 2003 domain) is our main production server. We want to install/setup Exchange 2007 (32-bit test version) for test purpose. We do not want our Exchange 2003 to be interrupted. Is it safe to install test Exchange 2007 on same domain that Exchange 2003 is running w/o interfacing each other? Is there anything I should be aware of during installation? We do not have an isolated test domain. Thanks.