Just wanted some claification. I have 2 Exchange servers, both hosting the CAS, HT, and MB roles. Both servers are members of a DAG for database failover. All outlook clients are currently connected to Server1, and the RpcClientAccessServer attribute are pointing to Server1 for all the databases. My boss believes that because the 2 server are members of a DAG, if Server1 goes down, clients can connect to the CAS on Server2 and connectivity will be uninteruppted. Is this correct? From what I understand, this is not true...and it's what the CAS Array is for. However, since we have a DAG, we can't use the CAS Array. Now, my question is if Server1 goes down, if I change the RpcClientAccessServer on the databases to Server2, will that do anything? What if I were to create load balancing using DNS Round Robins, would that work?

Just to add up some useful links to Jonas Andersson's. Having deployed two KEMP LoadMaster virtual appliances myself, I total agree with Jonas. Btw, they now support Hyper-V. Load Balancing Exchange 2010 Client Access Servers using an Hardware Load Balancer Solution (Part 1 through 3) http://www.msexchange.org/articles_tutorials/exchange-server-2010/high-availability-recovery/load-balancing-exchange-2010-client-access-servers-using-hardware-load-balancer-solution-part1.html Part 4 discusses the LoadMaster configuration Uncovering the new RPC Client Access Service in Exchange 2010 (Part 1 through 4) http://www.msexchange.org/articles_tutorials/exchange-server-2007/planning-architecture/uncovering-new-rpc-client-access-service-exchange-2010-part1.html Here you find KEMP's own guidelines for Exchange 2010 with firmware 5.1 http://www.kemptechnologies.com/emea/loadmaster-documentation.html An excellent source if you read German: http://www.loadbalancerblog.de/ MCTS: Messaging | MCSE: S+M | Small Business Specialist

That was some nice info for me aswell about Hyper-V :) Thanks Jonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog

There are some god reviews of KEMP's LoadBalancing offerings here: http://www.ntpro.nl/blog/archives/2032-Load-balancing-vCloud-Director-multi-cell-with-the-Kemp-Loadmaster.html http://vinfrastructure.it/en/2012/04/kemp-virtual-loadmaster-introduction/ http://vinfrastructure.it/en/2012/04/kemp-virtual-loadmaster-installation/ http://vinfrastructure.it/en/2012/04/kemp-virtual-loadmaster-configuration/ http://vinfrastructure.it/en/2012/04/kemp-virtual-loadmaster-load-balancing/ http://www.mikes.eu/index.php/home/item/kemp-s-server-load-balancing