Hi, We are having Windows 2003 Domain Controller and Exchange 5.5 in Windows NT 4.0 Server. We are migrating Exchange 5.5 to Exchange 2003 (Exchange 2003 is installed in another server. It is not an in place upgrade) The display name of the Exchange 5.5 Site (Directory) is having characters which are not supported in Exchange 2003. If we change the display name, will it affect the Existing Exchange 5.5 setup? I referred the site which is given below. It says, we can do it. But is there anyone who has practical experience in this issue? http://www.msexchange.org/tutorials/Exchange_2003_Upgrade_Checklist.html Thanks Mahadevan Confidentiality Statement: This message is intended only for the individual or entity to which it is addressed. It may contain privileged, confidential information which is exempt from disclosure under applicable laws. If you are not the intended recipient, please note that you are strictly prohibited from disseminating or distributing this information (other than to the intended recipient) or copying this information. If you have received this communication in error, please notify us immediately by return email.