I have 2 CAS Servers Do i have to NLB or can Forefront TMG Redirect the request to each server for me?

Hi, What is the version of your exchange server? You can use NLB or a third-party hardware-based network load-balancing device for Client Access server high availability. After that we can use TMG to publish OWA,autodiscover,etc to the public so that outside user can find the CAS server, Load Balancing Exchange 2007 Client Access Servers using Windows Network Load-Balancing Technology – Part 1: Overview of Windows NLB Clusters http://www.msexchange.org/articles_tutorials/exchange-server-2007/high-availability-recovery/load-balancing-exchange-2007-client-access-servers-windows-network-technology-part1.html Regards, Xiu