Hello,

Our team is involved in migration of Exchange 2007 deployed in three sites. In every site an Exchange 2013 CAS and Mailbox role servers were deployed.

The question: should we change the AutoDiscoverServiceInternalUri  on Exchange 2007 CAS servers to point to Exchange 2013 CAS?

Exchange 2013 CAS will give to Exchange 2007 clients the correct legacy information (like legacy.contoso.com) instead of mail.contoso.com (primary namespace moved from Exchange 2007 to Exchange 2013)?

T

I would.  The Exchange 2013 servers should deliver the correct Autodiscover information for the Exchange 2007 mailbox users.

Thanks for reply, will try that setting.

One more question regarding autodiscover for external Outlook clients with mailboxes on Exchange 2007. By using Test E-mail Autoconfiguration feature of Outlook, for Exchange 2007 mailbox, I receive a result httpStatus=401 status - it prompts password for account. After several password prompts, I get httpStatus=503. Please see screenshot attached for more details.

As I mentioned earlier, the Exchange deployment consists of 3 sites with Exchange 2007 and Exchange 2013 in coexistence. Two sites are non-Internet facing and one site is Internet facing through ISA Server 2006 array consisting of 2 servers for managing and one ISA Server 2006 management server.

For Exchange 2013 mailboxes, the issue doesn't appear.

I'm afraid that you're going to have trouble using ISA 2006 to do reverse publishing for Exchange 2013.

Are you using the same e-mail domain for the Exchange 2013 and Exchange 2007 mailboxes?  Exchange 2013 should return Autodiscover results for Exchange 2007 users.

Yes, we are using the same e-mail domain, like contoso.com, for both Exchange 2007 and Exchange 2013 mailboxes.

I will give here some more details for setup. Exchange 2007 is deployed in 3 AD sites:

- AD site A  - Internet facing site, two CAS 2007, two CAS 2013, ISA Server 2006 reverse proxy, several Mailbox servers

- AD site B - non-Internet facing site, one CAS 2007, one CAS 2013, one Mailbox server

- AD site C - non-Internet facing site, one CAS 2007, one CAS 2013, one Mailbox server.

In AD site A, on ISA 2006 external interface, there is a public IP with e-mail domain DNS name pointing to it

- legacy.contoso.com - listener D in ISA 2006, points to web farm of two Exchange 2007 CAS in AD site A

- mail.contoso.com - listener D in ISA 2006, points to web farm of two Exchange 2013 CAS in AD site A

Configuration on two Exchange 2013 CAS for Autodiscover virtual directory:

[PS] C:\Windows\system32>Get-AutodiscoverVirtualDirectory -Server CAS2013_01 | fl Identity,*Authentication*

Identity                      : CAS2013_01\Autodiscover (Default Web Site)
InternalAuthenticationMethods : {Basic, Ntlm, WindowsIntegrated, WSSecurity, OAuth}
ExternalAuthenticationMethods : {Basic, Ntlm, WindowsIntegrated, WSSecurity, OAuth}
LiveIdNegotiateAuthentication : False
WSSecurityAuthentication      : True
LiveIdBasicAuthentication     : False
BasicAuthentication           : True
DigestAuthentication          : False
WindowsAuthentication         : True
OAuthAuthentication           : True
AdfsAuthentication            : False

[PS] C:\Windows\system32>Get-AutodiscoverVirtualDirectory -Server CAS2013_01 | fl Identity,*Authentication*

Identity                      : CAS2013_02\Autodiscover (Default Web Site)
InternalAuthenticationMethods : {Basic, Ntlm, WindowsIntegrated, WSSecurity, OAuth}
ExternalAuthenticationMethods : {Basic, Ntlm, WindowsIntegrated, WSSecurity, OAuth}
LiveIdNegotiateAuthentication : False
WSSecurityAuthentication      : True
LiveIdBasicAuthentication     : False
BasicAuthentication           : True
DigestAuthentication          : False
WindowsAuthentication         : True
OAuthAuthentication           : True
AdfsAuthentication            : False

Configuration on two Exhange 2007 CAS in AD site A

[PS] C:\Windows\system32>Get-AutodiscoverVirtualDirectory -Server CAS2007_01 | fl Identity, *Authentication*

Identity                      : CAS2007_01\Autodiscover (Default Web Site)
InternalAuthenticationMethods : {Basic, Ntlm, WindowsIntegrated}
ExternalAuthenticationMethods : {Basic, Ntlm, WindowsIntegrated}
BasicAuthentication           : True
DigestAuthentication          : False
WindowsAuthentication         : True

[PS] C:\Windows\system32>Get-AutodiscoverVirtualDirectory -Server CAS2007_02 | fl Identity, *Authentication*

Identity                      : CAS2007_02\Autodiscover (Default Web Site)
InternalAuthenticationMethods : {Basic, Ntlm, WindowsIntegrated}
ExternalAuthenticationMethods : {Basic, Ntlm, WindowsIntegrated}
BasicAuthentication           : True
DigestAuthentication          : False
WindowsAuthentication         : True