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Watch this article:<br />
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<a href="http://msexchangeteam.com/archive/2009/12/17/453625.aspx" rel="ugc">http://msexchangeteam.com/archive/2009/12/17/453625.aspx</a><br />
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Watch this article:

http://msexchangeteam.com/archive/2009/12/17/453625.aspx [http://msexchangeteam.com/archive/2009/12/17/453625.aspx]



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Ok but it does not explain whether I should go with ISA 2006 vs Exchange 2010 Edge Transport.<br />
From what I've read, the Edge Transport role is placed in the DMZ as a standalone machine (just like my ISA server at present , and like ISA, the edge transport servers can also be in a NLB cluster. So I am thinking should I replace ISA with Edge transport servers ? Is it a best practice, or recommended ? 
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Ok but it does not explain whether I should go with ISA 2006 vs Exchange 2010 Edge Transport.
From what I've read, the Edge Transport role is placed in the DMZ as a standalone machine (just like my ISA server at present , and like ISA, the edge transport servers can also be in a NLB cluster. So I am thinking should I replace ISA with Edge transport servers ? Is it a best practice, or recommended ?

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Currently we have an ISA 2006 nlb cluster in a DMZ that forwards client requests to an Exchange 2003 OWA nlb cluster which then forwards to an Exchange 2003 active\passive cluster:<br />
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Remote client--&gt; ISA 2006 nlb---&gt; OWA nlb--&gt; Exchange backend<br />
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In transitioning to exchange 2010, should we publish the Ex2010 CAS nlb array in ISA (as we did for the exchange 2003 OWA nlb) OR replace the ISA servers with Edge transport servers nlb ? Any related web links would be appreciated.
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Currently we have an ISA 2006 nlb cluster in a DMZ that forwards client requests to an Exchange 2003 OWA nlb cluster which then forwards to an Exchange 2003 active\passive cluster:

Remote client--> ISA 2006 nlb---> OWA nlb--> Exchange backend

In transitioning to exchange 2010, should we publish the Ex2010 CAS nlb array in ISA (as we did for the exchange 2003 OWA nlb) OR replace the ISA servers with Edge transport servers nlb ? Any related web links would be appreciated.

Exchange 2010 edge transport or ISA 2006 ?

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.