Hello,I have migrated a User (Exchange 2003 to Exchange 2007) and its OWA doesn't work.Do I need to configure my ISA server as that user had a different domain? If so can you tell me how to do that?

Hi,How did you migrate exchange server 2003 to exchange 2007?What is role that you have deployed?Did you publish OWA 2007 via ISA?What do you mean different domain? SMTP namespace? Regards, Xiu

Set-Mailbox UserName -ApplyMandatoryProperties Run the powershell command above for the user in question.

Hi,Please note that exchange 2007 user use the right URL to access OWA.If you use the URL which is the exchange 2003 published via ISA, then I think we need to re-publish the URL.Since we have exchange 2007 installed into the Exchange 2003 environment,so owa requst will be get by CAS,if it is a exchange 2003 user request,then CAS will proxy the request to exchange 2003 server. Please note, CAS should be installed seperate from Mailbox server so that the proxy will work.Regards,Xiu