I have a mixed 2010 and 2007 environment.
My mailbox is on Exchange 2010, and I point to a casarray on the Exchange 2010 server as well to a database where my mailbox is in.
When I run Test Autodiscover from the Outlook system tray icon, the Results tab shows the correct Internal/External URL's.
However, when I click the "Log" tab, I'm showing:
Attempting URL https://mail3.domain.com/Autodiscover/Autodiscover.xml found through SCP
AutoDiscover to https://mail3.domain.com/Autodiscover/Autodiscover.xml starting GetLastError=0;httpStatus=302
AutodiscoverURL redirection to https://internal.domain.com/Autodiscover/Autodiscover.xml
Autodiscover to https://internal.domain.com/Autodiscover/Autodiscover.xml starting
GetLastError=0; httpStats = 200.
Autodiscover to https://internal.domain.com/Autodiscover/Autodiscover.xml Succeeded
The thing is here that "mail3" as initially contacted is an Exchange 2007 server. What would be causing that to come up first Autodiscover, anyway to change it? Internal is the specified internal URL on the 2010 CAS multi-role server.
In the internal domain DNS, autodiscover.domain.com is indeed pointing to the IP address that is Exchange 2010 server running CAS role. So not sure how the mail3 (exchange 2007 cas) is coming into the picture.
Would it have to do with AD Sites and Services?
The next part of the question I guess, would that be causing the issues I'm seeing in my environment where in Outlook client I get "Outlook is trying to retrieve data from the Microsoft Exchange server" periodically?