It could be a number of things, according to MS KB: 1) You typed two backslashes preceding the computer name when asked to enter the exchange 5.5 server name 2) DNS is set up improperly on the exchange 5.5 server and it cannot properly resolve the new server 3) The account you are logged on as does not have at least Administrator permission on the Exchange Server 5.5 Site and Configuration container 4) You installed the ADC from the Windows 2003 Server CD and not from the Exchange 2003 Server CD. 5) Your Exchange 5.5 LDAP service is not on port 389 plus a few other things. The detailed error message from the set up logfile would be required to pinpoint it (or you can fix all of the above items). ________________________________ From: Roberta Campos [mailto:rbcampos@xxxxxxxxxxxx] Sent: Thursday, April 01, 2004 8:40 AM To: [ExchangeList] Subject: [exchangelist] Upgrade Exchange 5.5 to Exchange 2003 http://www.MSExchange.org/ I have to migrate from Exchange 5.5 (on NT) to Exchange 2003 (on Win2003). First I used ADC to move the Mailboxes from Windows NT to Windows 2003. When I try Join Exchange 2003 on 5.5, this error occur: "Setup encountered an error while attempting to bind to the Excahnge server "serverold" 0xC103FC93 The account that I'm using has administrator rights on Exchange 5.5. What can I do? Thanks. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------