Microsoft recommends load balancing CA servers using ISA 2006. Iam trying to find some help or reference material to figure out how I can load balance 2 Exchange 2007 Client Access Servers using ISA 2006. Here is the situation: We have 2 CA servers lets call it CA01 and CA02 in the same subnet. I have setup split DNS so that both Intranet and Internet users can access the published Exchange through mail.XYZ.com. Questions: How can I setup load balancing for both servers so that mail.XYZ.com will direct requests to either CA01 or CA02? How many Trusted Certificates should I get. Can I use a single exportable certificate with multiple Subject Alternative Names (Example: CA01.XYZ.org, CA02.XYZ.org, etc.) and install the certificate on both CA servers and ISA server? Or do I need to buy 2 distinct Certificates? In ISA 2006, I create a web farm, and then create a listner, what certificate do I associate the listner? Can I associate the listner to two certificates? Any help in pointing me to some documentation or any other help is greatly appreciated. Thanks Mike Momjian

Hi Mike, Please check out these links: http://www.msexchange.org/articles_tutorials/exchange-server-2007/high-availability-recovery/load-balancing-exchange-2007-client-access-servers-windows-network-technology-part1.html http://www.ahmedgroup.co.uk/articles/19/1/How-to-enable-Network-Load-Balancing-with-ISA-2006-Enterprise-Edition/Page1.html http://technet.microsoft.com/en-us/library/aa997148(EXCHG.80).aspx http://technet.microsoft.com/en-us/library/bb794751.aspx http://technet.microsoft.com/en-us/library/bb332063.aspx http://blog.msfirewall.org.uk/2008/08/publishing-exchange-2007-services-with.html Some more useful links: http://www.shudnow.net/2008/06/24/publishing-symantec-enterprise-vault-in-isa-2006/http://www.petri.co.il/compare-isa-server%202004-isa-server-2006.htm