I ran into an issue with Exchange 2007 Network Load Balancing (NLB) Unicast Mode when running on Hyper-V running on full install of Server 2008 x64. To first understand the problem, it is useful to understand how NLB Unicast works.When running Unicast, the NIC that has NLB enabled will have its' MAC Address overwritten. When you add a second NLB member to your NLB … [Read more...] about Exchange 2007 Unicast NLB Issue on Hyper-V