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 --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe exchangelist
