I have two Exchange 2010 CAS server configured in a CAS array. These Exchange 2010 servers are on virtual machines using Hyper-V. (Windows 2008 SP2) Everything works fine until I have to reboot one of them. After I reboot, I'll open the Network Load Balancing Manager and they are not converged. It won't even let me ping the NLB NIC anymore after I reboot. I used the following article (http://support.microsoft.com/kb/953828
) and did give the NLB NIC on each CAS Server a static MAC, but this only works until I reboot. Has anyone experienced problem? Its caused me so much of a headache that I'm not evening using the CAS array at the moment. I just have all users pointed to one single CAS Server. Any help would be greatly appreciated. Thanks.