Try this http://support.microsoft.com/kb/240753 From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Dhirendra Kumar Sent: December-18-07 5:28 AM To: exchangelist@xxxxxxxxxxxxx; [ExchangeList] Subject: [ExchangeList] changing tcp port for owa access hi, i have exchange 2007 running i want to change the tcp port for OWA access in IIS. Can any body tell me the procedur for this . i have already tried directly by changing the port to somthing lese in IIS. but it is not working. So please help me out in this. Regards Dhirendra Singh