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This is the guide to what you want to achieve - for your reference<br />
<a href="http://support.microsoft.com/kb/830827" rel="ugc nofollow">http://support.microsoft.c<wbr />om/kb/8308<wbr />27</a><br />
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Thanks for the quick response but this does not address the behavior of the default exchange form that comes with ISA 2006. &nbsp;The ISA 2006 form caches the username in the cookie when Forms Based Authentication is used. &nbsp;ISA 2004 did not do this...
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well you could edit the listener , but as far to my experiance with that it doesnt really work.<br />
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you can only customize the form which will not be easyer :)<br />
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why do you want to change it anyway? 
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If a user, that hasn't been properly trained, chooses 'This is a private computer', it retains that setting and then any future visits to that site will populate the username field with the last successfully negotiated userid. &nbsp;For increased security, I'd like to disable that possibility similar to the behavior of ISA 2004 FBA...
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Unfortunately they are two different beasts. ISA2004 really only published owa services whereas ISA2006 does the job properly. Is there a real need to bridge the HTTPS through ISA rather than tunnel it straight through to the Exchange box? You could then edit the exchange owa pages instead 
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tc , i see what you mean and I'm afraid I'm not familiar with a solution to this.<br />
would be great to actually control that.
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ISA 2006 publishing OWA for Exchange 2003. &nbsp;<br />
FBA with AD.<br />
Logon form has 'This is private computer' option. &nbsp;When this option is selected, the username is cached in a cookie on that client for this site. &nbsp;How do you &lt;easily&gt; &lt;gracefully&gt; disable this setting so that usernames can not be cached in cookies?<br />
<br />
Is this possible without disabling the option so that users can still select 'this is a private computer' to extend their session time BUT NOT have thier username show up the next time that client device goes to this page?<br />
<a href="https://filedb.experts-exchange.com/incoming/2009/03_w11/116159/owascreenshot.bmp" target="_blank" class="file-inline" title="Screenshot of ISA 2006 Exchange form. (744 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>owascreenshot.bmp</a>
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owascreenshot.bmp

ISA 2006 publishing OWA for Exchange 2003.  
FBA with AD.
Logon form has 'This is private computer' option.  When this option is selected, the username is cached in a cookie on that client for this site.  How do you <easily> <gracefully> disable this setting so that usernames can not be cached in cookies?

Is this possible without disabling the option so that users can still select 'this is a private computer' to extend their session time BUT NOT have thier username show up the next time that client device goes to this page?

How to disable 'private computer' setting that caches the username for ISA FBA authentication form?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

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

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.