See if this site helps you... http://support.microsoft.com/?kbid=893608 Could you tell the current setup (Org & Sites) which you have? You can very well create mailbox for users in Ex2k3 if the users in EX5.5 is able to view the Ex2k3 users in its GAL. Regards, Maha ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Amit Kapoor Sent: Friday, September 22, 2006 4:03 PM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Problem in creating Mailboxes Importance: High Hi, I have Exchange 2003 with Windows 2000 Server domain controller. We have one Global Catalog Server. This week we have changed the domain controller role of a machine to Global Catalog & Exchange 2003 it is taking the new machine as Global Catalog server. But when I create a new user in Active Directory and I go on to create its mailbox in Exchange 5.5 it says no mapping between SID found. Even the user is replicated from Global catalog server to other domain controller. Is exchange 5.5 is looking for previous Global catalog server which is now working as a domain controller now. When I try to move mailbox from Exchange 5.5 to Exchange 2003 it gives error in event log with error id "8183 source "MSADC" and "8270" soruce "MSADC" How do I correct this problem? Or how can I create mailboxes Exchange 2003 without involving Exchange 5.5 in the process. Please Help. ps. check out our latest product: www.DriveInside.com - India's No. 1 Auto Website ___________________________________________________________ Amit Kapoor | Network Engineer Module One India Ltd. | A88 Okhla Phase II, New Delhi - 110020 Voice : +91-11-41859200 ext. 204 | Fax : +91-11-41859220 | Mobile : +91-98730-86450 Email : amit@xxxxxxxxxxxxx | Web: www.moduleone.com 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.