Here is my issue and it completely boggles me......note Exchange2000 coexistence with Exchange 2007 I initially had an issue with CAS 2007 and Mailbox server roles not redirecting properly (returning internal URL to External requests) so it was suggested to move the CAS server role to a stand alone server. I did this and low and behold the redirection started working properly ...... or so I thought ...... not so fast there skippy When I access the following URL's this is the error that I get https://webmail.domain.ca/exchange I get a logon page enter in a user with a 2000 mailbox BINGO! I am in (this didn't work before) Now I test https://webmail.domain.ca/exchange I get a logon page enter in a user with a 2007 mailbox it redirects me to https://webmail.domain.ca/owa/exchange and I get a 404 error. Now my understanding is that this should redirect me to /owa and not /owa/exchange only. If I remove the /exchange on the end of the /owa no problem. Why is this re-directing me to /owa/exchange????? How do I fix this????? I have recreated all the virtual directories using the cmdlets on both servers even removed all virtual directories and the CAS server role and reinstalled the CAS server role and setup the virtual directories on the Mailbox server as required........ Still no luck. Now before I go spend a whole lot of money with Microsoft support and a whole lot of wait time on the phone I was hoping someone could give me some detailed information on how to concisely correct this issue? Thanks, Adrian Wise

HI Adrian, Please have a look of below post which might help you. Outlook Web Access and Exchange 2007, 2003 and 2000 coexistence: http://msexchangeteam.com/archive/2007/02/07/434523.aspx http://social.technet.microsoft.com/Forums/en-US/exchangesvrmigration/thread/4b49cdff-c843-4cd2-89ac-798f226b223d/ Anil

Well I ended up talking to Microsoft on this issue and it was an easy fix. After uninstalling the CAS server role from the MB server and installing the CAS server on its own stand alone server, the uninstall did not remove the Redirection to OWA set in the Default Web Site - Redirection properties on the Mailbox server. Once I removed the redirect by deleting the URL and unchecking all boxes and restarting IIS........BINGO OWA redirected as it should. (Note: IIS7+Exchange2007 SP3+Windows Server 2008 SP2) Hope this helps someone else as it caused me lots of heartache and time. Thanks, Adrian Wise

In a resource forest design, the linked-master account may be missing. Running the following should resolve the issue: set-mailbox -id username -linkedmasteraccount domain\username -linkeddomaincontroller domaincontroller