Thanks to all for your help! The issue proved to be the listeners needing to
be the same for both rules (2010 plus redirect to legacy server) - at least
as far as external access goes. Internal clients still require to login
twice but since it is only for a couple of days its not a biggie.

On Thu, Jan 20, 2011 at 6:41 AM, Knoch, James W
<[email protected]>wrote:

> I am not sure if this holds true on Forefront TMG or UAG, but it applies to
> ISA 2006, so I expect it to be the same.  In order for FSO to work between
> the 2003 and 2010 published sites, they MUST be on the same listener.  Make
> sure you have your *.domain.com listed as well in the FSO settings.
>
> Also there is some behavior with IE8 you should be aware of when using the
> FSO features.  If you connect to a trusted site that then refers you to an
> untrusted site, you will be prompted with the form again for the legacy 2003
> page.  I ran into this and figured it out when I had the main OWA URL
> trusted on my home computer instead of the entire domain.
>
>
> James Knoch
> Senior Systems Engineer, Network Services
> Intergraph Corporation
>
>
> -----Original Message-----
> From: Michael B. Smith [mailto:[email protected]]
> Sent: Wednesday, January 19, 2011 6:12 AM
> To: MS-Exchange Admin Issues
> Subject: RE: Outlook Web Co-existence between 2010 and 2003 (Single Sign
> On)
>
> Do you have the 2003 server set to FBA _on the server_? Did you apply the
> AUTH patch that 2003 needs?
>
> Regards,
>
> Michael B. Smith
> Consultant and Exchange MVP
> http://TheEssentialExchange.com
>
>
> -----Original Message-----
> From: Mark Milo [mailto:[email protected]]
> Sent: Wednesday, January 19, 2011 1:44 AM
> To: MS-Exchange Admin Issues
> Subject: Outlook Web Co-existence between 2010 and 2003 (Single Sign On)
>
> Hi,
>
> We are currently in the process of migrating from Exchange 2003 to Exchange
> 2010. I am looking for some advice on getting Outlook Web co-existance
> between Exchange 2003 and Exchange 2010 (latest SP) during the migration.
> Both Exchange servers (fully patched) are front-ended by a Forefront
> security server situated on the DMZ/internal network. It is a joined to the
> internal domain The issue I am having is that 2003 clients need to log on
> twice - first when they connect to forefront (webmail.domain.com) and
> again when they get re-directed to the legacy.domain.com. 2010 clients
> work correctly ie single log on and they are connected to their mailbox.
>
> The CAS and 2003 front end server are both set to basic authentication.
>
> Exchange 2003 Settings on Forefront Server
>
> Front end server for 2003 Clients - set to basic Authentication The
> listener for exchange 2003 clients is set to HTML form auth and
> Authentication validation is Windows (AD). SSO is enabled
>
> Exchange 2010 Settings on Forefront Server
>
> The listener for exchange 2010 clients is set to HTML form auth and
> Authentication validation is Windows (AD). SSO is enabled
>
>
> Any help is really aprreciated - this thing has been driving me nuts!
>
>
> Thanks Mark
>
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