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Look it...<br />
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Enabling forms-based authentication for <u>external and internal</u> Outlook Web App 2010 (OWA 2010) users where Exchange 2010 is published using Forefront TMG 2010. <br />
<a href="http://www.msexchange.org/articles_tutorials/exchange-server-2010/management-administration/enabling-forms-based-authentication-external-internal-owa-2010-users-exchange-2010-published-using-forefront-tmg-2010-part5.html" rel="ugc">http://www.msexchange.org/articles_tutorials/exchange-server-2010/management-administration/enabling-forms-based-authentication-external-internal-owa-2010-users-exchange-2010-published-using-forefront-tmg-2010-part5.html</a>
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Look it...

Enabling forms-based authentication for external and internal Outlook Web App 2010 (OWA 2010) users where Exchange 2010 is published using Forefront TMG 2010.
http://www.msexchange.org/articles_tutorials/exchange-server-2010/management-administration/enabling-forms-based-authentication-external-internal-owa-2010-users-exchange-2010-published-using-forefront-tmg-2010-part5.html [http://www.msexchange.org/articles_tutorials/exchange-server-2010/management-administration/enabling-forms-based-authentication-external-internal-owa-2010-users-exchange-2010-published-using-forefront-tmg-2010-part5.html]

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I'm specifically interested in load balancing MAPI, not OWA, OA, ECP, or AS.
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I'm specifically interested in load balancing MAPI, not OWA, OA, ECP, or AS.

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In the end, you can't use FFTMG to load balance MAPI directly. &nbsp;You would have to use a load balancer.
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In the end, you can't use FFTMG to load balance MAPI directly.  You would have to use a load balancer.

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I read this, but gave credit because you helped.
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I read this, but gave credit because you helped.

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I'm trying to use my FFTMG to load balance my CAS array by pointing the CAS array URL to my FFTMG. &nbsp;The result is that it is prompting my clients for their credentials and it takes about a minute to connect successfully. &nbsp;The workstations are domain joined and should not prompt for authentication. &nbsp;It shouldn't prompt them for their credentials and it shouldn't take but 5 seconds or less to connect.
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I'm trying to use my FFTMG to load balance my CAS array by pointing the CAS array URL to my FFTMG.  The result is that it is prompting my clients for their credentials and it takes about a minute to connect successfully.  The workstations are domain joined and should not prompt for authentication.  It shouldn't prompt them for their credentials and it shouldn't take but 5 seconds or less to connect.

Exchange 2010 w/FFTMG

Microsoft Forefront, formerly known as Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache that runs on Windows servers. It includes identity management and protection systems, and discontinued systems for threat management and network protection, along with protection for Sharepoint and Exchange. The scope of discussions includes forward and reverse proxy, application and service publishing, virtual private networks (VPNs), outbound access rules, SSL certificates and network routing within either a single node or an highly-available array pairing.

Microsoft Forefront ISA Server

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.